diff --git a/src/dig.cpp b/src/dig.cpp
index ddd6fa2..53c998a 100644
--- a/src/dig.cpp
+++ b/src/dig.cpp
@@ -2722,7 +2722,7 @@ int init_threading_model(struct scalpelState *state) {
         if(pthread_mutex_init(&workavailable[i], 0)) {
             //return SCALPEL_ERROR_PTHREAD_FAILURE;
             std::string msg ("COULDN'T CREATE MUTEX\n");
-            fprintf(stderr, msg.c_str());
+            fprintf(stderr, "%s", msg.c_str());
             throw std::runtime_error(msg);
         }
 
@@ -2730,7 +2730,7 @@ int init_threading_model(struct scalpelState *state) {
 
         if(pthread_mutex_init(&workcomplete[i], 0)) {
             std::string msg ("COULDN'T CREATE MUTEX\n");
-            fprintf(stderr, msg.c_str());
+            fprintf(stderr, "%s", msg.c_str());
             throw std::runtime_error(msg);
         }		
 
@@ -2743,7 +2743,7 @@ int init_threading_model(struct scalpelState *state) {
             (&searchthreads[i], NULL, &threadedFindAll, &threadargs[i])) {
                 //return SCALPEL_ERROR_PTHREAD_FAILURE;
                 std::string msg ("COULDN'T CREATE THREAD\n");
-                fprintf(stderr, msg.c_str());
+                fprintf(stderr, "%s", msg.c_str());
                 throw std::runtime_error(msg);
         }
     }
diff --git a/src/helpers.cpp b/src/helpers.cpp
index b0c4daa..bbbeae2 100644
--- a/src/helpers.cpp
+++ b/src/helpers.cpp
@@ -452,7 +452,7 @@ void handleError(struct scalpelState *state, int error)
         msg = "Scalpel will write only to empty output directories to avoid\n"
             "mixing the output from multiple carving operations.\n"
             "Please specify a different output directory or delete the specified\noutput directory.\n";
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         closeAuditFile(state->auditFile);
         throw std::runtime_error(msg);
         break;
@@ -461,7 +461,7 @@ void handleError(struct scalpelState *state, int error)
         // fatal--unable to write files, which may mean that disk space is exhausted.
         msg = "Scalpel was unable to write output files and will abort.\n"
             "This error generally indicates that disk space is exhausted.\n";
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         closeAuditFile(state->auditFile);
         throw std::runtime_error(msg);
         break;
diff --git a/src/prioque.cpp b/src/prioque.cpp
index 18e6d1f..03402c9 100644
--- a/src/prioque.cpp
+++ b/src/prioque.cpp
@@ -152,13 +152,13 @@ void nolock_add_to_queue(Queue * q, void *element, int priority)
             new_element = (Queue_element) malloc(sizeof(struct _Queue_element));
             if(new_element == 0) {
                 std::string msg ("Malloc failed in function add_to_queue()\n");
-                fprintf(stderr, msg.c_str());
+                fprintf(stderr, "%s", msg.c_str());
                 throw std::runtime_error(msg);
             }
             new_element->info = (void *)malloc(q->elementsize);
             if(new_element->info == 0) {
                 std::string msg("Malloc failed in function add_to_queue()\n");
-                fprintf(stderr, msg.c_str());
+                fprintf(stderr, "%s", msg.c_str());
                 throw std::runtime_error(msg);
             }
 
@@ -224,7 +224,7 @@ void remove_from_front(Queue * q, void *element)
 #if defined(CONSISTENCY_CHECKING)
     if(q->queue == 0) {
         std::string msg("Malloc failed in function remove_from_front()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -256,7 +256,7 @@ void peek_at_current(Queue * q, void *element)
 #if defined(CONSISTENCY_CHECKING)
     if(q->queue == 0 || q->current == 0) {
         std::string msg("NULL pointer in function peek_at_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -281,7 +281,7 @@ void *pointer_to_current(Queue * q)
 #if defined(CONSISTENCY_CHECKING)
     if(q->queue == 0 || q->current == 0) {
         std::string msg("NULL pointer in function pointer_to_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -308,7 +308,7 @@ int current_priority(Queue * q)
 #if defined(CONSISTENCY_CHECKING)
     if(q->queue == 0 || q->current == 0) {
         std::string msg("NULL pointer in function peek_at_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -333,7 +333,7 @@ void update_current(Queue * q, void *element)
 #if defined(CONSISTENCY_CHECKING)
     if(q->queue == 0 || q->current == 0) {
         std::string msg("Malloc failed in function update_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -357,7 +357,7 @@ void delete_current(Queue * q)
 #if defined(CONSISTENCY_CHECKING)
     if(q->queue == 0 || q->current == 0) {
         std::string msg("Malloc failed in function delete_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -411,12 +411,12 @@ void nolock_next_element(Queue * q)
 #if defined(CONSISTENCY_CHECKING)
     if(q->queue == 0) {
         std::string msg("NULL pointer in function next_element()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else if(q->current == 0) {
         std::string msg("Advance past end in NULL pointer in function next_element()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -483,14 +483,14 @@ void copy_queue(Queue * q1, Queue * q2)
 
         if(new_element == 0) {
             std::string msg("Malloc failed in function copy_queue()\n");
-            fprintf(stderr, msg.c_str());
+            fprintf(stderr, "%s", msg.c_str());
             throw std::runtime_error(msg);
         }
 
         new_element->info = (void *)malloc(q1->elementsize);
         if(new_element->info == 0) {
             std::string msg("Malloc failed in function copy_queue()\n");
-            fprintf(stderr, msg.c_str());
+            fprintf(stderr, "%s", msg.c_str());
             throw std::runtime_error(msg);
         }
         memcpy(new_element->info, temp->info, q1->elementsize);
@@ -600,7 +600,7 @@ void local_peek_at_current(Context * ctx, void *element)
 #if defined(CONSISTENCY_CHECKING)
     if(ctx->queue == 0 || ctx->current == 0) {
         std::string msg("NULL pointer in function peek_at_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -626,7 +626,7 @@ void *local_pointer_to_current(Context * ctx)
 #if defined(CONSISTENCY_CHECKING)
     if(ctx->queue == 0 || ctx->current == 0) {
         std::string msg("NULL pointer in function pointer_to_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -653,7 +653,7 @@ int local_current_priority(Context * ctx)
 #if defined(CONSISTENCY_CHECKING)
     if(ctx->queue == 0 || ctx->current == 0) {
         std::string msg("NULL pointer in function peek_at_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -677,7 +677,7 @@ void local_update_current(Context * ctx, void *element)
 #if defined(CONSISTENCY_CHECKING)
     if(ctx->queue == 0 || ctx->current == 0) {
         std::string msg("NULL pointer in function update_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -701,7 +701,7 @@ void local_delete_current(Context * ctx)
 #if defined(CONSISTENCY_CHECKING)
     if(ctx->queue == 0 || ctx->current == 0) {
         std::string msg("NULL pointer in function delete_current()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
@@ -755,12 +755,12 @@ void local_nolock_next_element(Context * ctx)
 #if defined(CONSISTENCY_CHECKING)
     if(ctx->queue == 0) {
         std::string msg("NULL pointer in function next_element()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else if(ctx->current == 0) {
         std::string msg("Advance past end in NULL pointer in function next_element()\n");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }
     else
diff --git a/src/scalpel.cpp b/src/scalpel.cpp
index 70404da..ff6cd44 100644
--- a/src/scalpel.cpp
+++ b/src/scalpel.cpp
@@ -118,7 +118,7 @@ int extractSearchSpecData(struct scalpelState *state,
         ss << "ERROR: GPU search for regex headers is not supported!\n";
         ss << "Please modify the config file for non-regex headers only.\n";
         std::string msg = ss.str();
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
 #endif
 
@@ -152,7 +152,7 @@ int extractSearchSpecData(struct scalpelState *state,
         ss << "ERROR: GPU search for regex footers is not supported!\n";
         ss << "Please modify the config file for non-regex footers only.\n";
         std::string msg = ss.str();
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
 #endif  
 
diff --git a/src/syncqueue.cpp b/src/syncqueue.cpp
index 1d6846c..d276924 100644
--- a/src/syncqueue.cpp
+++ b/src/syncqueue.cpp
@@ -71,7 +71,7 @@ syncqueue_t *syncqueue_init(const char *qname, unsigned long size) {
     q = (syncqueue_t *) calloc(1, sizeof(syncqueue_t));
     if(q == NULL) {
         std::string msg("Couldn't create queue! Aborting.");
-        fprintf(stderr, msg.c_str());
+        fprintf(stderr, "%s", msg.c_str());
         throw std::runtime_error(msg);
     }