diff --git a/gcc/fixproto b/gcc/fixproto
index 6f7d701868c..7a06df42c28 100755
--- a/gcc/fixproto
+++ b/gcc/fixproto
@@ -287,7 +287,7 @@ for code in ALL STD ; do
 	    stdlib.h)
 	      required_list="$required_stdlib_h" ;;
 	    string.h)
-	      required_list="memchr memcmp memcpy memmove memset strcat strchr strcmp strcoll strcpy strcspn strerror strlen strncat strncmp" ;;
+	      required_list="memchr memcmp memcpy memmove memset strcat strchr strcmp strcoll strcpy strcspn strerror strlen strncat strncmp strncpy strpbrk strrchr strspn strstr strtok strxfrm" ;;
 # Should perhaps also add NULL and size_t
 	    sys/stat.h)
 	      required_list="chmod fstat mkdir mkfifo stat lstat umask"