diff --git a/samples/c/contours.c b/samples/c/contours.c
index e53a25a042..58939e47af 100644
--- a/samples/c/contours.c
+++ b/samples/c/contours.c
@@ -19,10 +19,11 @@ CvSeq* contours = 0;
 
 static void on_trackbar(int pos)
 {
-    (void)pos;
     IplImage* cnt_img = cvCreateImage( cvSize(w,w), 8, 3 );
     CvSeq* _contours = contours;
     int _levels = levels - 3;
+    (void)pos;
+
     if( _levels <= 0 ) // get to the nearest face to make it look more funny
         _contours = _contours->h_next->h_next->h_next;
     cvZero( cnt_img );
@@ -53,13 +54,14 @@ static void findCComp( IplImage* img )
 
 int main(int argc, char* argv[])
 {
-    (void)argc; (void)argv;
     int i, j;
     CvMemStorage* storage = cvCreateMemStorage(0);
     IplImage* img = cvCreateImage( cvSize(w,w), 8, 1 );
     IplImage* img32f = cvCreateImage( cvSize(w,w), IPL_DEPTH_32F, 1 );
     IplImage* img32s = cvCreateImage( cvSize(w,w), IPL_DEPTH_32S, 1 );
     IplImage* img3 = cvCreateImage( cvSize(w,w), 8, 3 );
+    (void)argc; (void)argv;
+
     help();
     cvZero( img );
 
diff --git a/samples/c/fback_c.c b/samples/c/fback_c.c
index 2a061e96ae..af613d25e4 100644
--- a/samples/c/fback_c.c
+++ b/samples/c/fback_c.c
@@ -16,8 +16,8 @@ static void help(void)
 static void drawOptFlowMap(const CvMat* flow, CvMat* cflowmap, int step,
                     double scale, CvScalar color)
 {
-    (void)scale;
     int x, y;
+    (void)scale;
     for( y = 0; y < cflowmap->rows; y += step)
         for( x = 0; x < cflowmap->cols; x += step)
         {
@@ -30,9 +30,9 @@ static void drawOptFlowMap(const CvMat* flow, CvMat* cflowmap, int step,
 
 int main( int argc, char** argv )
 {
-    (void)argc; (void)argv;
     CvCapture* capture = cvCreateCameraCapture(0);
     CvMat* prevgray = 0, *gray = 0, *flow = 0, *cflow = 0;
+    (void)argc; (void)argv;
 
     help();
 
diff --git a/samples/c/morphology.c b/samples/c/morphology.c
index ac89953402..3071490599 100644
--- a/samples/c/morphology.c
+++ b/samples/c/morphology.c
@@ -17,9 +17,10 @@ int erode_dilate_pos = 0;
 // callback function for open/close trackbar
 static void OpenClose(int pos)
 {
-    (void)pos;
     int n = open_close_pos - max_iters;
     int an = n > 0 ? n : -n;
+    (void)pos;
+
     element = cvCreateStructuringElementEx( an*2+1, an*2+1, an, an, element_shape, 0 );
     if( n < 0 )
     {
@@ -38,9 +39,10 @@ static void OpenClose(int pos)
 // callback function for erode/dilate trackbar
 static void ErodeDilate(int pos)
 {
-    (void)pos;
     int n = erode_dilate_pos - max_iters;
     int an = n > 0 ? n : -n;
+    (void)pos;
+
     element = cvCreateStructuringElementEx( an*2+1, an*2+1, an, an, element_shape, 0 );
     if( n < 0 )
     {