diff --git a/ext/fileinfo/php_libmagic.c b/ext/fileinfo/php_libmagic.c
index eaa7d3e94e6..05123fa8133 100644
--- a/ext/fileinfo/php_libmagic.c
+++ b/ext/fileinfo/php_libmagic.c
@@ -19,7 +19,7 @@
 
 zend_string* convert_libmagic_pattern(const char *val, size_t len, uint32_t options)
 {
-	int i, j;
+	size_t i, j;
 	zend_string *t;
 
 	for (i = j = 0; i < len; i++) {