diff --git a/scripts/ecdhe.py b/scripts/ecdhe.py
index 3b891da74e1..383afc1a0ce 100755
--- a/scripts/ecdhe.py
+++ b/scripts/ecdhe.py
@@ -126,7 +126,7 @@ def scalar_mult(k, point):
     """Returns k * point computed using the double and point_add algorithm."""
     assert is_on_curve(point)
 
-    if k % curve.p == 0 or point is None:
+    if k % curve.n == 0 or point is None:
         return None
 
     if k < 0:
diff --git a/scripts/ecdsa.py b/scripts/ecdsa.py
index 71fad300cf7..c50d379b0e0 100755
--- a/scripts/ecdsa.py
+++ b/scripts/ecdsa.py
@@ -127,7 +127,7 @@ def scalar_mult(k, point):
     """Returns k * point computed using the double and point_add algorithm."""
     assert is_on_curve(point)
 
-    if k % curve.p == 0 or point is None:
+    if k % curve.n == 0 or point is None:
         return None
 
     if k < 0: