diff --git a/samples/gpu/performance/performance.cpp b/samples/gpu/performance/performance.cpp
index 886c5e2f2d..1b5a0bf8c5 100644
--- a/samples/gpu/performance/performance.cpp
+++ b/samples/gpu/performance/performance.cpp
@@ -4,20 +4,9 @@
 using namespace std;
 using namespace cv;
 
-
-void Test::gen(Mat& mat, int rows, int cols, int type, Scalar low, Scalar high)
-{   
-    mat.create(rows, cols, type);
-
-    RNG rng(0);
-    rng.fill(mat, RNG::UNIFORM, low, high);
-}
-
-
 void Test::gen(Mat& mat, int rows, int cols, int type)
 {   
     mat.create(rows, cols, type);
-
     Mat mat8u(rows, cols * mat.elemSize(), CV_8U, mat.data, mat.step);
 
     RNG rng(0);
@@ -35,7 +24,6 @@ void TestSystem::run()
     vector<Test*>::iterator it = tests_.begin();
     for (; it != tests_.end(); ++it)
     {
-        can_flush_ = false;
         Test* test = *it;
 
         cout << endl << test->name() << ":\n";
@@ -82,6 +70,7 @@ void TestSystem::flush()
     description_.str("");
 
     cout << resetiosflags(ios_base::fixed | ios_base::left) << endl;
+    
     can_flush_ = false;
 }
 
diff --git a/samples/gpu/performance/performance.h b/samples/gpu/performance/performance.h
index ef0787cf8b..354c54e411 100644
--- a/samples/gpu/performance/performance.h
+++ b/samples/gpu/performance/performance.h
@@ -1,3 +1,6 @@
+#ifndef OPENCV_GPU_SAMPLE_PERFORMANCE_H_
+#define OPENCV_GPU_SAMPLE_PERFORMANCE_H_
+
 #include <iostream>
 #include <cstdio>
 #include <vector>
@@ -7,13 +10,10 @@
 class Test
 {
 public:
-    Test(const std::string& name): name_(name) {}
+    explicit Test(const std::string& name): name_(name) {}
 
     const std::string& name() const { return name_; }
 
-    void gen(cv::Mat& mat, int rows, int cols, int type,
-             cv::Scalar low, cv::Scalar high);
-
     void gen(cv::Mat& mat, int rows, int cols, int type);
 
     virtual void run() = 0;
@@ -96,4 +96,6 @@ private:
 #define CPU_OFF TestSystem::instance()->cpuOff()
 #define GPU_OFF TestSystem::instance()->gpuOff()
 #define SUBTEST TestSystem::instance()->subtest()
-#define DESCRIPTION TestSystem::instance()->subtest()
\ No newline at end of file
+#define DESCRIPTION TestSystem::instance()->subtest()
+
+#endif // OPENCV_GPU_SAMPLE_PERFORMANCE_H_
\ No newline at end of file