diff --git a/include/ffi_common.h b/include/ffi_common.h
index 37f5a9e9..be10922e 100644
--- a/include/ffi_common.h
+++ b/include/ffi_common.h
@@ -48,7 +48,7 @@ char *alloca ();
 #endif
 
 /* Check for the existence of memcpy. */
-#if STDC_HEADERS
+#if STDC_HEADERS || HAVE_STRING_H
 # include <string.h>
 #else
 # ifndef HAVE_MEMCPY