diff --git a/tools/cws2fws.c b/tools/cws2fws.c
index 84feda959ef37e7888048d1ef63ce13d25317c3b..d6cd2edd781aa1dcee1f63eb3aca2ffdcc481718 100644
--- a/tools/cws2fws.c
+++ b/tools/cws2fws.c
@@ -22,7 +22,7 @@
 #ifdef DEBUG
 #define dbgprintf printf
 #else
-#define dbgprintf(...)
+#define dbgprintf(...) do { if (0) printf(__VA_ARGS__); } while (0)
 #endif
 
 int main(int argc, char *argv[])