diff --git a/include/dix.h b/include/dix.h
index ea83e1161..64035fec7 100644
--- a/include/dix.h
+++ b/include/dix.h
@@ -566,7 +566,7 @@ extern int xstrncasecmp(const char *s1, const char *s2, size_t n);
 
 #if NEED_STRCASESTR
 #define strcasestr xstrcasestr
-extern int xstrcasestr(const char *s, const char *find);
+extern char *xstrcasestr(const char *s, const char *find);
 #endif
 
 /*