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-rw-r--r--include/afl-fuzz.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/afl-fuzz.h b/include/afl-fuzz.h
index ff0b239c..aa879a40 100644
--- a/include/afl-fuzz.h
+++ b/include/afl-fuzz.h
@@ -30,7 +30,7 @@
 #define MESSAGES_TO_STDOUT
 
 #ifndef _GNU_SOURCE
-#define _GNU_SOURCE
+#define _GNU_SOURCE 1
 #endif
 #define _FILE_OFFSET_BITS 64