diff --git a/doc/py_tutorials/py_imgproc/py_colorspaces/py_colorspaces.markdown b/doc/py_tutorials/py_imgproc/py_colorspaces/py_colorspaces.markdown
index 1418ef95d..8fbd8dc36 100644
--- a/doc/py_tutorials/py_imgproc/py_colorspaces/py_colorspaces.markdown
+++ b/doc/py_tutorials/py_imgproc/py_colorspaces/py_colorspaces.markdown
@@ -62,7 +62,7 @@ while(1):
     upper_blue = np.array([130,255,255])
 
     # Threshold the HSV image to get only blue colors
-    mask = cv2.inRange(hsv, lower_green, upper_green)
+    mask = cv2.inRange(hsv, lower_blue, upper_blue)
 
     # Bitwise-AND mask and original image
     res = cv2.bitwise_and(frame,frame, mask= mask)