diff --git a/expansion/$tests/convolution/xor_convolution.test.py b/expansion/$tests/convolution/xor_convolution.test.py
index 4adc841..370a8bc 100644
--- a/expansion/$tests/convolution/xor_convolution.test.py
+++ b/expansion/$tests/convolution/xor_convolution.test.py
@@ -26,6 +26,9 @@ def f(A):
                     if MOD != -1:
                         A[j] = (x + y) % MOD
                         A[j + h] = (x - y) % MOD
+                    else:
+                        A[j] = x + y
+                        A[j + h] = x - y
             h *= 2
 
     f(A)
diff --git a/expansion/convolution/xor_convolution.py b/expansion/convolution/xor_convolution.py
index 682f725..86dbf00 100644
--- a/expansion/convolution/xor_convolution.py
+++ b/expansion/convolution/xor_convolution.py
@@ -19,6 +19,9 @@ def f(A):
                     if MOD != -1:
                         A[j] = (x + y) % MOD
                         A[j + h] = (x - y) % MOD
+                    else:
+                        A[j] = x + y
+                        A[j + h] = x - y
             h *= 2
 
     f(A)