diff --git a/get_points.py b/get_points.py
index a825d44..be5ed4f 100644
--- a/get_points.py
+++ b/get_points.py
@@ -49,7 +49,7 @@ def callback(event, x, y, flags, param):
         # Display the cropped images
         cv2.namedWindow(window_name_2, cv2.WINDOW_NORMAL)
         cv2.imshow(window_name_2, im_disp)
-        key = cv2.waitKey(30)
+        key = (0xFF & cv2.waitKey(30))
         if key == ord('p'):
             # Press key `s` to return the selected points
             cv2.destroyAllWindows()
diff --git a/object-tracker-multiple.py b/object-tracker-multiple.py
index f86bd03..1854cd3 100644
--- a/object-tracker-multiple.py
+++ b/object-tracker-multiple.py
@@ -20,7 +20,7 @@ def run(source=0, dispLoc=False):
         if not retval:
             print "Cannot capture frame device"
             exit()
-        if(cv2.waitKey(10)==ord('p')):
+        if(0xFF & cv2.waitKey(10))==ord('p'):
             break
         cv2.namedWindow("Image", cv2.WINDOW_NORMAL)
         cv2.imshow("Image", img)
@@ -66,7 +66,7 @@ def run(source=0, dispLoc=False):
         cv2.namedWindow("Image", cv2.WINDOW_NORMAL)
         cv2.imshow("Image", img)
         # Continue until the user presses ESC key
-        if cv2.waitKey(1) == 27:
+        if (0xFF & cv2.waitKey(1)) == 27:
             break
 
     # Relase the VideoCapture object
diff --git a/object-tracker-single.py b/object-tracker-single.py
index c29d7aa..3824611 100644
--- a/object-tracker-single.py
+++ b/object-tracker-single.py
@@ -20,7 +20,7 @@ def run(source=0, dispLoc=False):
         if not retval:
             print "Cannot capture frame device"
             exit()
-        if(cv2.waitKey(10)==ord('p')):
+        if(0xFF & cv2.waitKey(10))==ord('p'):
             break
         cv2.namedWindow("Image", cv2.WINDOW_NORMAL)
         cv2.imshow("Image", img)
@@ -65,7 +65,7 @@ def run(source=0, dispLoc=False):
         cv2.namedWindow("Image", cv2.WINDOW_NORMAL)
         cv2.imshow("Image", img)
         # Continue until the user presses ESC key
-        if cv2.waitKey(1) == 27:
+        if (0xFF & cv2.waitKey(1)) == 27:
             break
 
     # Relase the VideoCapture object