diff --git a/modules/core/src/umatrix.cpp b/modules/core/src/umatrix.cpp
index 742e3a2eb5..2b77ddfd94 100644
--- a/modules/core/src/umatrix.cpp
+++ b/modules/core/src/umatrix.cpp
@@ -744,7 +744,7 @@ void UMat::convertTo(OutputArray _dst, int _type, double alpha, double beta) con
 
         char cvt[2][40];
         ocl::Kernel k("convertTo", ocl::core::convert_oclsrc,
-                      format("-D srcT=%s -D WT=%s -D dstT=%s -D convertToWT=%s -D convertToDT=%s%s",
+                      format("-D srcT=%s -D WT=%s -D dstT=%s -D convertToWT=%s -D convertToDT=%s%s%s",
                              ocl::typeToStr(sdepth), ocl::typeToStr(wdepth), ocl::typeToStr(ddepth),
                              ocl::convertTypeStr(sdepth, wdepth, 1, cvt[0]),
                              ocl::convertTypeStr(wdepth, ddepth, 1, cvt[1]),
diff --git a/modules/core/test/ocl/test_matrix_operation.cpp b/modules/core/test/ocl/test_matrix_operation.cpp
index b19b74f543..c32aa5a3fa 100644
--- a/modules/core/test/ocl/test_matrix_operation.cpp
+++ b/modules/core/test/ocl/test_matrix_operation.cpp
@@ -85,7 +85,7 @@ PARAM_TEST_CASE(ConvertTo, MatDepth, MatDepth, Channels, bool)
     }
 };
 
-OCL_TEST_P(ConvertTo, Accuracy)
+OCL_TEST_P(ConvertTo, WithScale_Accuracy)
 {
     for (int j = 0; j < test_loop_times; j++)
     {
@@ -101,6 +101,20 @@ OCL_TEST_P(ConvertTo, Accuracy)
     }
 }
 
+OCL_TEST_P(ConvertTo, NoScale_Accuracy)
+{
+    for (int j = 0; j < test_loop_times; j++)
+    {
+        generateTestData();
+
+        OCL_OFF(src_roi.convertTo(dst_roi, dstType, 1, 0));
+        OCL_ON(usrc_roi.convertTo(udst_roi, dstType, 1, 0));
+
+        double eps = CV_MAT_DEPTH(dstType) >= CV_32F ? 2e-4 : 1;
+        OCL_EXPECT_MATS_NEAR(dst, eps);
+    }
+}
+
 //////////////////////////////// CopyTo /////////////////////////////////////////////////
 
 PARAM_TEST_CASE(CopyTo, MatDepth, Channels, bool, bool)