diff --git a/modules/imgproc/src/smooth.dispatch.cpp b/modules/imgproc/src/smooth.dispatch.cpp
index 69d07580f2..b001a37f89 100644
--- a/modules/imgproc/src/smooth.dispatch.cpp
+++ b/modules/imgproc/src/smooth.dispatch.cpp
@@ -566,7 +566,7 @@ static bool ipp_GaussianBlur(InputArray _src, OutputArray _dst, Size ksize,
         if (IPP_DISABLE_GAUSSIAN_BLUR_32FC4_1TH && (threads == 1 && src.type() == CV_32FC4))
             return false;
 
-        if(IPP_GAUSSIANBLUR_PARALLEL && threads > 1) {
+        if(IPP_GAUSSIANBLUR_PARALLEL && threads > 1 && iwSrc.m_size.height/(threads * 4) >= ksize.height/2) {
             bool ok;
             ipp_gaussianBlurParallel invoker(iwSrc, iwDst, ksize.width, (float) sigma1, ippBorder, &ok);
 
diff --git a/modules/imgproc/test/test_filter.cpp b/modules/imgproc/test/test_filter.cpp
index 3e28a2caad..6de6cf4f87 100644
--- a/modules/imgproc/test/test_filter.cpp
+++ b/modules/imgproc/test/test_filter.cpp
@@ -2355,5 +2355,16 @@ TEST(Imgproc, filter_empty_src_16857)
     EXPECT_TRUE(dst2.empty());
 }
 
+TEST(Imgproc_GaussianBlur, regression_11303)
+{
+    cv::Mat dst;
+    int width = 2115;
+    int height = 211;
+    double sigma = 8.64421;
+    cv::Mat src(cv::Size(width, height), CV_32F, 1);
+    cv::GaussianBlur(src, dst, cv::Size(), sigma, sigma);
+    EXPECT_LE(cv::norm(src, dst, NORM_L2), 1e-3);
+}
+
 
 }} // namespace