diff --git a/modules/gapi/test/gapi_opaque_tests.cpp b/modules/gapi/test/gapi_opaque_tests.cpp
index 08ea3b1b9b..07e483fd0f 100644
--- a/modules/gapi/test/gapi_opaque_tests.cpp
+++ b/modules/gapi/test/gapi_opaque_tests.cpp
@@ -37,7 +37,7 @@ G_TYPED_KERNEL(PaintPoint, <GMat(GPointOpaque, int, int, cv::Size)>, "test.opaqu
 };
 
 struct MyCustomType{
-    int num;
+    int num = -1;
     std::string s;
 };