description: fix a format string issue
--- a/src/AmpHead.hpp
+++ b/src/AmpHead.hpp
@@ -183,6 +183,6 @@ typedef struct {
 #define SWAP(a, b, _t) (a) = (_t)((long)a ^ (long)(b)); (b) = (_t)((long)(a) ^ (long)(b)); (a) = (_t)((long)(a) ^ (long)(b));
 #define NZ(a, b) ((a) == 0 ? (b) : (a))
 
-#define MSG(message) if (logFile) fprintf(logFile, message); fflush(logFile)
+#define MSG(message) if (logFile) fprintf(logFile, "%s", message); fflush(logFile)
 
 #endif