diff --git a/util/expr.c b/util/expr.c
index 9c0c889..7a37501 100644
--- a/util/expr.c
+++ b/util/expr.c
@@ -21,8 +21,8 @@
 #include <string.h>
 #include <ctype.h>
 #include <stdint.h>
-#include <regex.h>
 #include <assert.h>
+
 #include "expr.h"
 #include "stab.h"
 #include "util.h"