diff --git a/config/udev.c b/config/udev.c
index 144b905e5..39067e336 100644
--- a/config/udev.c
+++ b/config/udev.c
@@ -483,7 +483,7 @@ static char *strrstr(const char *haystack, const char *needle)
 {
     char *prev, *last, *tmp;
 
-    prev = strstr(haystack, needle);
+    prev = (char *) strstr(haystack, needle);
     if (!prev)
         return NULL;