diff --git a/modules/imgproc/src/smooth.dispatch.cpp b/modules/imgproc/src/smooth.dispatch.cpp
index b001a37f89..2fb2fef8b7 100644
--- a/modules/imgproc/src/smooth.dispatch.cpp
+++ b/modules/imgproc/src/smooth.dispatch.cpp
@@ -635,6 +635,9 @@ void GaussianBlur(InputArray _src, OutputArray _dst, Size ksize,
         return;
     }
 
+    if (sigma2 <= 0)
+        sigma2 = sigma1;
+
     bool useOpenCL = ocl::isOpenCLActivated() && _dst.isUMat() && _src.dims() <= 2 &&
                _src.rows() >= ksize.height && _src.cols() >= ksize.width &&
                ksize.width > 1 && ksize.height > 1;