diff --git a/server/gen_test_char.c b/server/gen_test_char.c
index 42ecdded10..bdf77db63f 100644
--- a/server/gen_test_char.c
+++ b/server/gen_test_char.c
@@ -62,6 +62,9 @@
 #if APR_HAVE_STDIO_H
 #include <stdio.h>
 #endif
+#if APR_HAVE_STRING_H
+#include <string.h>
+#endif
 
 /* A bunch of functions in util.c scan strings looking for certain characters.
  * To make that more efficient we encode a lookup table.