diff --git a/reactos/tools/wmc/getopt.c b/reactos/tools/wmc/getopt.c
index b82688b7928..e9dec676603 100644
--- a/reactos/tools/wmc/getopt.c
+++ b/reactos/tools/wmc/getopt.c
@@ -40,6 +40,9 @@
 #endif
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
 
 /* Comment out all this code if we are using the GNU C Library, and are not
    actually compiling the library itself.  This code is part of the GNU C