diff --git a/modules/imgproc/src/morph.cpp b/modules/imgproc/src/morph.cpp
index cb25a50c7b..c18e5c8066 100644
--- a/modules/imgproc/src/morph.cpp
+++ b/modules/imgproc/src/morph.cpp
@@ -159,7 +159,7 @@ template<class VecUpdate> struct MorphRowVec
             i += vtype::nlanes/2;
         }
 
-        return i;
+        return i - i % cn;
     }
 
     int ksize, anchor;