diff --git a/ext/standard/image.c b/ext/standard/image.c
index c16ee1c6f9a..d3335decdc9 100644
--- a/ext/standard/image.c
+++ b/ext/standard/image.c
@@ -579,7 +579,7 @@ static struct gfxinfo *php_handle_jpc(php_stream * stream TSRMLS_DC)
 	unsigned short dummy_short;
 	int dummy_int, highest_bit_depth, bit_depth;
 	unsigned char first_marker_id;
-	int i;
+	unsigned int i;
 
 	/* JPEG 2000 components can be vastly different from one another.
 	   Each component can be sampled at a different resolution, use