diff --git a/apache2/modsecurity.h b/apache2/modsecurity.h
index 8ff1ac55..a3776823 100644
--- a/apache2/modsecurity.h
+++ b/apache2/modsecurity.h
@@ -33,6 +33,8 @@ typedef struct msc_string msc_string;
 /* For GNU C, tell the compiler to check printf like formatters */
 #if defined(__GNUC__)
 #define PRINTF_ATTRIBUTE(a,b) __attribute__((format (printf, a, b)))
+#else
+#define PRINTF_ATTRIBUTE(a,b)
 #endif
 
 #include "msc_logging.h"