diff --git a/modules/core/include/opencv2/core/cuda.hpp b/modules/core/include/opencv2/core/cuda.hpp
index 8191c00783..4eeb70b217 100644
--- a/modules/core/include/opencv2/core/cuda.hpp
+++ b/modules/core/include/opencv2/core/cuda.hpp
@@ -240,6 +240,10 @@ public:
 
     //! converts GpuMat to another datatype (Blocking call)
     void convertTo(OutputArray dst, int rtype) const;
+    //! bindings overload which converts GpuMat to another datatype (Blocking call)
+    CV_WRAP void convertTo(CV_OUT GpuMat& dst, int rtype) const {
+        convertTo(static_cast<OutputArray>(dst), rtype);
+    }
 
     //! converts GpuMat to another datatype (Non-Blocking call)
     void convertTo(OutputArray dst, int rtype, Stream& stream) const;
@@ -251,7 +255,7 @@ public:
     //! converts GpuMat to another datatype with scaling (Blocking call)
     void convertTo(OutputArray dst, int rtype, double alpha, double beta = 0.0) const;
     //! bindings overload which converts GpuMat to another datatype with scaling(Blocking call)
-    CV_WRAP void convertTo(CV_OUT GpuMat& dst, int rtype, double alpha = 1.0, double beta = 0.0) const {
+    CV_WRAP void convertTo(CV_OUT GpuMat& dst, int rtype, double alpha, double beta = 0.0) const {
         convertTo(static_cast<OutputArray>(dst), rtype, alpha, beta);
     }
 
diff --git a/modules/core/src/cuda/gpu_mat.cu b/modules/core/src/cuda/gpu_mat.cu
index a86888cac3..b6f95445db 100644
--- a/modules/core/src/cuda/gpu_mat.cu
+++ b/modules/core/src/cuda/gpu_mat.cu
@@ -546,7 +546,7 @@ void cv::cuda::GpuMat::convertTo(OutputArray _dst, int rtype, Stream& stream) co
         return;
     }
 
-    CV_DbgAssert( sdepth <= CV_64F && ddepth <= CV_64F );
+    CV_Assert( sdepth <= CV_64F && ddepth <= CV_64F );
 
     GpuMat src = *this;
 
@@ -578,6 +578,8 @@ void cv::cuda::GpuMat::convertTo(OutputArray _dst, int rtype, double alpha, doub
     const int sdepth = depth();
     const int ddepth = CV_MAT_DEPTH(rtype);
 
+    CV_Assert(sdepth <= CV_64F && ddepth <= CV_64F);
+
     GpuMat src = *this;
 
     _dst.create(size(), rtype);