diff --git a/src/cairo-image-info.c b/src/cairo-image-info.c
index 2ecce954a..3b4cf6edb 100644
--- a/src/cairo-image-info.c
+++ b/src/cairo-image-info.c
@@ -154,7 +154,7 @@ _cairo_image_info_get_jpeg_info (cairo_image_info_t	*info,
 		break;
 	    }
 
-	    if (p + 2 > data + length)
+	    if (p + 3 > data + length)
 		return CAIRO_INT_STATUS_UNSUPPORTED;
 
 	    p = _jpeg_skip_segment (p);