diff --git a/contrib/patch/getopt.c b/contrib/patch/getopt.c
index 300f86de3eb..a22c4fab7c2 100644
--- a/contrib/patch/getopt.c
+++ b/contrib/patch/getopt.c
@@ -43,6 +43,7 @@ USA.  */
 #endif
 
 #include <stdio.h>
+#include <string.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