diff --git a/modules/features2d/src/calonder.cpp b/modules/features2d/src/calonder.cpp
index fd9925c47..695801645 100644
--- a/modules/features2d/src/calonder.cpp
+++ b/modules/features2d/src/calonder.cpp
@@ -413,7 +413,7 @@ static float percentile(float *data, int n, float p)
    assert(n>0);
    assert(p>=0 && p<=1);
    std::vector<float> vec(data, data+n);
-   sort(vec.begin(), vec.end());
+   std::sort(vec.begin(), vec.end());
    int ix = (int)(p*(n-1));
    return vec[ix];
 }
@@ -1299,7 +1299,7 @@ static float percentile( const float* data, int n, float p )
    assert( p>=0 && p<=1 );
 
    vector<float> vec( data, data+n );
-   sort(vec.begin(), vec.end());
+   std::sort(vec.begin(), vec.end());
    int ix = (int)(p*(n-1));
    return vec[ix];
 }
diff --git a/modules/haartraining/createsamples.cpp b/modules/haartraining/createsamples.cpp
index 02aa92952..71debcc94 100644
--- a/modules/haartraining/createsamples.cpp
+++ b/modules/haartraining/createsamples.cpp
@@ -50,6 +50,8 @@
 #include <cstdlib>
 #include <cmath>
 
+using namespace std;
+
 #include "cvhaartraining.h"
 
 int main( int argc, char* argv[] )
diff --git a/modules/haartraining/haartraining.cpp b/modules/haartraining/haartraining.cpp
index 9347b54bb..f85a3c1f5 100644
--- a/modules/haartraining/haartraining.cpp
+++ b/modules/haartraining/haartraining.cpp
@@ -49,6 +49,8 @@
 #include <cstring>
 #include <cstdlib>
 
+using namespace std;
+
 #include "cvhaartraining.h"
 
 int main( int argc, char* argv[] )
diff --git a/modules/imgproc/src/_kdtree.hpp b/modules/imgproc/src/_kdtree.hpp
index fe1d66405..b46c99588 100644
--- a/modules/imgproc/src/_kdtree.hpp
+++ b/modules/imgproc/src/_kdtree.hpp
@@ -337,7 +337,7 @@ private:
 
     // add bbf_node for alternate branch in priority queue
     pq.push_back(bbf_node(alt_n, dist));
-    push_heap(pq.begin(), pq.end());
+    std::push_heap(pq.begin(), pq.end());
   }
 
   // called by bbf to walk to leaf;
@@ -374,11 +374,11 @@ private:
     bbf_nn nn(p, distance(d, p));
     if ((int) nn_pq.size() < k) {
       nn_pq.push_back(nn);
-      push_heap(nn_pq.begin(), nn_pq.end());
+      std::push_heap(nn_pq.begin(), nn_pq.end());
     } else if (nn_pq[0].dist > nn.dist) {
-      pop_heap(nn_pq.begin(), nn_pq.end());
+      std::pop_heap(nn_pq.begin(), nn_pq.end());
       nn_pq.end()[-1] = nn;
-      push_heap(nn_pq.begin(), nn_pq.end());
+      std::push_heap(nn_pq.begin(), nn_pq.end());
     }
     assert(nn_pq.size() < 2 || nn_pq[0].dist >= nn_pq[1].dist);
   }
@@ -405,7 +405,7 @@ public:
     while (tmp_pq.size() && emax > 0) {
 
       // from node nearest query point d, run to leaf
-      pop_heap(tmp_pq.begin(), tmp_pq.end());
+      std::pop_heap(tmp_pq.begin(), tmp_pq.end());
       bbf_node bbf(tmp_pq.end()[-1]);
       tmp_pq.erase(tmp_pq.end() - 1);
 
diff --git a/tests/cv/src/acameracalibration.cpp b/tests/cv/src/acameracalibration.cpp
index f387e6638..665ba4782 100644
--- a/tests/cv/src/acameracalibration.cpp
+++ b/tests/cv/src/acameracalibration.cpp
@@ -1610,9 +1610,9 @@ double CV_StereoCalibrationTest_C::calibrateStereoCamera( const vector<vector<Po
 	{
 		ni = (int)objectPoints[i].size();
 		((int*)npoints.data)[i] = ni;
-		copy(objectPoints[i].begin(), objectPoints[i].end(), objPtData + j);
-		copy(imagePoints1[i].begin(), imagePoints1[i].end(), imgPtData + j);
-		copy(imagePoints2[i].begin(), imagePoints2[i].end(), imgPtData2 + j);
+		std::copy(objectPoints[i].begin(), objectPoints[i].end(), objPtData + j);
+		std::copy(imagePoints1[i].begin(), imagePoints1[i].end(), imgPtData + j);
+		std::copy(imagePoints2[i].begin(), imagePoints2[i].end(), imgPtData2 + j);
 	}
 	CvMat _objPt = objPt, _imgPt = imgPt, _imgPt2 = imgPt2, _npoints = npoints;
 	CvMat _cameraMatrix1 = cameraMatrix1, _distCoeffs1 = distCoeffs1;
diff --git a/tests/cxcore/src/asolvepoly.cpp b/tests/cxcore/src/asolvepoly.cpp
index a8b6ef9ba..b8f9c6dab 100644
--- a/tests/cxcore/src/asolvepoly.cpp
+++ b/tests/cxcore/src/asolvepoly.cpp
@@ -98,8 +98,8 @@ void CV_SolvePolyTest::run( int )
             for (int j = 0; j < n; ++j)
 	            ar[j] = complex_type(u[j * 2], u[j * 2 + 1]);
 
-            sort(r.begin(), r.end(), pred_complex());
-            sort(ar.begin(), ar.end(), pred_complex());
+            std::sort(r.begin(), r.end(), pred_complex());
+            std::sort(ar.begin(), ar.end(), pred_complex());
 
             pass = true;
             if( n == 3 )
@@ -114,7 +114,7 @@ void CV_SolvePolyTest::run( int )
                     nr2 = cv::solveCubic(cv::Mat_<float>(cv::Mat(&amat)), umat2);
                 cvFlip(&amat, &amat, 0);
                 if(nr2 > 0)
-                    sort(ar2.begin(), ar2.begin()+nr2, pred_double());
+                    std::sort(ar2.begin(), ar2.begin()+nr2, pred_double());
                 ar2.resize(nr2);
 
                 int nr1 = 0;
diff --git a/tests/cxts/cxts.cpp b/tests/cxts/cxts.cpp
index 37c38cb42..269572fea 100644
--- a/tests/cxts/cxts.cpp
+++ b/tests/cxts/cxts.cpp
@@ -886,8 +886,8 @@ void CvTest::run( int start_from )
                     break;
             }
 
-			sort(v_cpe.begin(), v_cpe.end());
-			sort(v_time.begin(), v_time.end());
+			std::sort(v_cpe.begin(), v_cpe.end());
+			std::sort(v_time.begin(), v_time.end());
 			
             t_cpu_acc = v_cpe[i/2];
             t_acc = v_time[i/2];