diff --git a/modules/photo/src/align.cpp b/modules/photo/src/align.cpp
index cfb8a5d84b..d83bf69d92 100644
--- a/modules/photo/src/align.cpp
+++ b/modules/photo/src/align.cpp
@@ -123,7 +123,7 @@ public:
         Mat img0 = _img0.getMat();
         Mat img1 = _img1.getMat();
         CV_Assert(img0.channels() == 1 && img0.type() == img1.type());
-        CV_Assert(img0.size() == img0.size());
+        CV_Assert(img0.size() == img1.size());
 
         int maxlevel = static_cast<int>(log((double)max(img0.rows, img0.cols)) / log(2.0)) - 1;
         maxlevel = min(maxlevel, max_bits - 1);