diff --git a/src/string/strcasecmp.c b/src/string/strcasecmp.c
index 6e827fd..0dcefa2 100644
--- a/src/string/strcasecmp.c
+++ b/src/string/strcasecmp.c
@@ -7,5 +7,5 @@ int strcasecmp(const char *s1, const char *s2)
 		s1 += 1;
 		s2 += 1;
 	}
-	return (*s1 - *s2);
+	return tolower(*s1) - tolower(*s2);
 }