diff --git a/circuits/gates.circom b/circuits/gates.circom
index 374353e9..3b836121 100644
--- a/circuits/gates.circom
+++ b/circuits/gates.circom
@@ -46,7 +46,7 @@ template NOT() {
     signal input in;
     signal output out;
 
-    out <== 1 + in - 2*in;
+    out <== 1 - in;
 }
 
 template NAND() {