diff --git a/packages/contracts/contracts/base/SemaphoreVerifier.sol b/packages/contracts/contracts/base/SemaphoreVerifier.sol
index a3793b037..beb31313f 100644
--- a/packages/contracts/contracts/base/SemaphoreVerifier.sol
+++ b/packages/contracts/contracts/base/SemaphoreVerifier.sol
@@ -241,7 +241,7 @@ contract SemaphoreVerifier {
 
         assembly {
             function checkField(v) {
-                if iszero(lt(v, q)) {
+                if iszero(lt(v, r)) {
                     mstore(0, 0)
                     return(0, 0x20)
                 }