diff --git a/lib/mprintf.c b/lib/mprintf.c
index 629a9e07cedb0118fc5fe5c89f25e74cc0c7a7f2..4650961d159dc265cee1f4335d59cf734e73e691 100644
--- a/lib/mprintf.c
+++ b/lib/mprintf.c
@@ -590,7 +590,7 @@ static int dprintf_formatf(
                  the second argument */
   /* function pointer called for each output character */
 
-#if _WIN32_WCE
+#ifdef _WIN32_WCE
   int (__cdecl *stream) (int, FILE *),
 #else
   int (*stream)(int, FILE *),