1 files changed, 3 insertions, 1 deletions

diff --git a/expr.c b/expr.c
index eed2637f2..71bd22417 100644
--- a/expr.c
+++ b/expr.c
@@ -35,9 +35,11 @@
 
 #include "busybox.h"
 #include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <regex.h>
 #include <sys/types.h>
 
-#include <regex.h>
 
 /* The kinds of value we can have.  */
 enum valtype {