diff --git a/core_main.c b/core_main.c
index a4beeb6..6bc010e 100644
--- a/core_main.c
+++ b/core_main.c
@@ -364,9 +364,9 @@ for (i = 0; i < MULTITHREAD; i++)
                   default_num_contexts * results[0].iterations
                       / time_in_secs(total_time));
 #else
-    ee_printf("Total time (secs): %d\n", time_in_secs(total_time));
+    ee_printf("Total time (secs): %"PRIu32"\n", time_in_secs(total_time));
     if (time_in_secs(total_time) > 0)
-        ee_printf("Iterations/Sec   : %d\n",
+        ee_printf("Iterations/Sec   : %"PRIu32"\n",
                   default_num_contexts * results[0].iterations
                       / time_in_secs(total_time));
 #endif
diff --git a/coremark.h b/coremark.h
index d054200..2a9a3ac 100644
--- a/coremark.h
+++ b/coremark.h
@@ -41,6 +41,8 @@ Original Author: Shay Gal-on
 #include <stdio.h>
 #endif
 #if HAS_PRINTF
+/* Adding inttypes.h (C99) to support PRIu32 in printf */
+#include <inttypes.h>
 #define ee_printf printf
 #endif