diff --git a/src/util.c b/src/util.c
index 904256a64..18448d253 100644
--- a/src/util.c
+++ b/src/util.c
@@ -177,7 +177,7 @@ int is_binary(const void* buf, const int buf_len) {
         /* Disk IO is so slow that it's worthwhile to do this calculation after every suspicious byte. */
         /* This is true even on a 1.6Ghz Atom with an Intel 320 SSD. */
         /* Read at least 32 bytes before making a decision */
-        if (i >= 32 && (suspicious_bytes * 100) / total_bytes > 20) {
+        if (i >= 32 && (suspicious_bytes * 100) / total_bytes > 10) {
             return 1;
         }
 
@@ -201,7 +201,7 @@ int is_binary(const void* buf, const int buf_len) {
             suspicious_bytes++;
         }
     }
-    if ((suspicious_bytes * 100) / total_bytes > 20) {
+    if ((suspicious_bytes * 100) / total_bytes > 10) {
         return 1;
     }