diff --git a/modules/imgproc/src/demosaicing.cpp b/modules/imgproc/src/demosaicing.cpp
index f70f3e8dfa..5520369f60 100644
--- a/modules/imgproc/src/demosaicing.cpp
+++ b/modules/imgproc/src/demosaicing.cpp
@@ -1686,8 +1686,11 @@ void cv::demosaicing(InputArray _src, OutputArray _dst, int code, int dcn)
             CV_Error(CV_StsUnsupportedFormat, "Bayer->Gray demosaicing only supports 8u and 16u types");
         break;
 
-    case CV_BayerBG2BGR: case CV_BayerGB2BGR: case CV_BayerRG2BGR: case CV_BayerGR2BGR:
     case CV_BayerBG2BGRA: case CV_BayerGB2BGRA: case CV_BayerRG2BGRA: case CV_BayerGR2BGRA:
+        if (dcn <= 0)
+          dcn = 4;
+        /* fallthrough */
+    case CV_BayerBG2BGR: case CV_BayerGB2BGR: case CV_BayerRG2BGR: case CV_BayerGR2BGR:
     case CV_BayerBG2BGR_VNG: case CV_BayerGB2BGR_VNG: case CV_BayerRG2BGR_VNG: case CV_BayerGR2BGR_VNG:
         {
             if (dcn <= 0)