diff --git a/modules/gapi/include/opencv2/gapi/core.hpp b/modules/gapi/include/opencv2/gapi/core.hpp
index 9ee45deb1d..bdc7af6d39 100644
--- a/modules/gapi/include/opencv2/gapi/core.hpp
+++ b/modules/gapi/include/opencv2/gapi/core.hpp
@@ -581,7 +581,7 @@ Supported matrix data types are @ref CV_8UC1, @ref CV_8UC3, @ref CV_16UC1, @ref
 @param ddepth optional depth of the output matrix.
 @sa add, sub, div, addWeighted
 */
-GAPI_EXPORTS GMat mul(const GMat& src1, const GMat& src2, double scale, int ddepth = -1);
+GAPI_EXPORTS GMat mul(const GMat& src1, const GMat& src2, double scale = 1.0, int ddepth = -1);
 
 /** @brief Multiplies matrix by scalar.
 
diff --git a/modules/gapi/perf/common/gapi_core_perf_tests_inl.hpp b/modules/gapi/perf/common/gapi_core_perf_tests_inl.hpp
index d1b72e6b9a..ccf55eee53 100644
--- a/modules/gapi/perf/common/gapi_core_perf_tests_inl.hpp
+++ b/modules/gapi/perf/common/gapi_core_perf_tests_inl.hpp
@@ -201,11 +201,11 @@ PERF_TEST_P_(MulPerfTest, TestPerformance)
     initMatsRandU(type, sz, dtype, false);
 
     // OpenCV code ///////////////////////////////////////////////////////////
-    cv::multiply(in_mat1, in_mat2, out_mat_ocv, dtype);
+    cv::multiply(in_mat1, in_mat2, out_mat_ocv, 1.0, dtype);
 
     // G-API code ////////////////////////////////////////////////////////////
     cv::GMat in1, in2, out;
-    out = cv::gapi::mul(in1, in2, dtype);
+    out = cv::gapi::mul(in1, in2, 1.0, dtype);
     cv::GComputation c(GIn(in1, in2), GOut(out));
 
     // Warm-up graph engine:
diff --git a/modules/gapi/test/common/gapi_operators_tests.hpp b/modules/gapi/test/common/gapi_operators_tests.hpp
index 37bed923a1..5a5a53fed4 100644
--- a/modules/gapi/test/common/gapi_operators_tests.hpp
+++ b/modules/gapi/test/common/gapi_operators_tests.hpp
@@ -149,11 +149,11 @@ g_api_ocv_pair_mat_mat opPlusM =  {std::string{"operator+"},
                                             [](cv::GMat in1,cv::GMat in2){return in1+in2;},
                                             [](const cv::Mat& in1, const cv::Mat& in2, cv::Mat& out){cv::add(in1, in2, out);}};
 g_api_ocv_pair_mat_mat opMinusM = {std::string{"operator-"},
-                                            [](cv::GMat in,cv::GMat c){return in-c;},
-                                            [](const cv::Mat& in, const cv::Mat& c, cv::Mat& out){cv::subtract(in, c, out);}};
+                                            [](cv::GMat in,cv::GMat in2){return in-in2;},
+                                            [](const cv::Mat& in, const cv::Mat& in2, cv::Mat& out){cv::subtract(in, in2, out);}};
 g_api_ocv_pair_mat_mat opDivM = {std::string{"operator/"},
-                                            [](cv::GMat in,cv::GMat c){return in/c;},
-                                            [](const cv::Mat& in, const cv::Mat& c, cv::Mat& out){cv::divide(in, c, out);}};
+                                            [](cv::GMat in,cv::GMat in2){return in/in2;},
+                                            [](const cv::Mat& in, const cv::Mat& in2, cv::Mat& out){cv::divide(in, in2, out);}};
 g_api_ocv_pair_mat_mat opGreater =  {std::string{"operator>"},
                                             [](cv::GMat in1,cv::GMat in2){return in1>in2;},
                                             [](const cv::Mat& in1, const cv::Mat& in2, cv::Mat& out){cv::compare(in1, in2, out, cv::CMP_GT);}};