diff --git a/modules/gpu/src/cuda/internal_shared.hpp b/modules/gpu/src/cuda/internal_shared.hpp
index 193fcb3a24..3351043561 100644
--- a/modules/gpu/src/cuda/internal_shared.hpp
+++ b/modules/gpu/src/cuda/internal_shared.hpp
@@ -60,11 +60,7 @@ namespace cv { namespace gpu
         BORDER_REFLECT_GPU,
         BORDER_WRAP_GPU
     };
-
-    // Converts CPU border extrapolation mode into GPU internal analogue.
-    // Returns true if the GPU analogue exists, false otherwise.
-    bool tryConvertToGpuBorderType(int cpuBorderType, int& gpuBorderType);
-
+  
     class NppStreamHandler
     {
     public:
diff --git a/modules/gpu/src/denoising.cpp b/modules/gpu/src/denoising.cpp
index 6c7a6695ba..0e28cd4c6d 100644
--- a/modules/gpu/src/denoising.cpp
+++ b/modules/gpu/src/denoising.cpp
@@ -49,10 +49,9 @@ using namespace cv::gpu;
 
 void cv::gpu::bilateralFilter(const GpuMat&, GpuMat&, int, float, float, int, Stream&) { throw_nogpu(); }
 void cv::gpu::nonLocalMeans(const GpuMat&, GpuMat&, float, int, int, int, Stream&) { throw_nogpu(); }
-void cv::gpu::fastNlMeansDenoising( const GpuMat&, GpuMat&, float, int, int, Stream&) { throw_nogpu(); }
 
 void cv::gpu::FastNonLocalMeansDenoising::simpleMethod(const GpuMat&, GpuMat&, float, int, int, Stream&) { throw_nogpu(); }
-void cv::gpu::FastNonLocalMeansDenoising::labMethod( const GpuMat&, GpuMat, float, float, int, int, Stream&) { throw_nogpu(); }
+void cv::gpu::FastNonLocalMeansDenoising::labMethod( const GpuMat&, GpuMat&, float, float, int, int, Stream&) { throw_nogpu(); }
 
 
 #else
diff --git a/modules/gpu/src/precomp.cpp b/modules/gpu/src/precomp.cpp
index fb2823be77..1f16f33a30 100644
--- a/modules/gpu/src/precomp.cpp
+++ b/modules/gpu/src/precomp.cpp
@@ -41,10 +41,12 @@
 
 #include "precomp.hpp"
 
-
-
 bool cv::gpu::tryConvertToGpuBorderType(int cpuBorderType, int& gpuBorderType)
 {
+#if !defined (HAVE_CUDA)
+    (void)cpuBorderType;
+    (void)gpuBorderType;
+#else
     switch (cpuBorderType)
     {
     case cv::BORDER_REFLECT101:
@@ -65,10 +67,9 @@ bool cv::gpu::tryConvertToGpuBorderType(int cpuBorderType, int& gpuBorderType)
     default:
         return false;
     };
+#endif
     return false;
 }
 
-
-
 /* End of file. */
 
diff --git a/modules/gpu/src/precomp.hpp b/modules/gpu/src/precomp.hpp
index 1cf467c4cf..da5036fb49 100644
--- a/modules/gpu/src/precomp.hpp
+++ b/modules/gpu/src/precomp.hpp
@@ -123,9 +123,18 @@
     static inline void throw_nogpu() { CV_Error(CV_StsNotImplemented, "The called functionality is disabled for current build or platform"); }
 
 #else /* defined(HAVE_CUDA) */
-
+    
     static inline void throw_nogpu() { CV_Error(CV_GpuNotSupported, "The library is compiled without GPU support"); }
 
 #endif /* defined(HAVE_CUDA) */
 
+
+namespace cv { namespace gpu 
+{
+    // Converts CPU border extrapolation mode into GPU internal analogue.
+    // Returns true if the GPU analogue exists, false otherwise.
+    bool tryConvertToGpuBorderType(int cpuBorderType, int& gpuBorderType);
+
+}}
+
 #endif /* __OPENCV_PRECOMP_H__ */