1 files changed, 2 insertions, 2 deletions
diff --git a/testing_and_debugging/script.rst b/testing_and_debugging/script.rst
index 28bc9f1..0ecc590 100644
--- a/testing_and_debugging/script.rst
+++ b/testing_and_debugging/script.rst
@@ -70,7 +70,7 @@ Open an editor and type the code shown on the slide and save it as gcd.py
 {{{ Show slide, gcd function }}}
 
 def gcd(a, b):
-    if a % b == 0:
+    if b == 0:
        return a
     return gcd(b, a%b)
 
@@ -101,7 +101,7 @@ test case we know that the GCD is 16. So that is the expected output.
 {{{ Show slide,Test for gcd.py }}}
 
     def gcd(a, b):
-        if a % b == 0:
+        if b == 0:
             return a
         return gcd(b, a%b)