diff --git a/src/libs/LibSchnorr.sol b/src/libs/LibSchnorr.sol
index bc05a71..1262893 100644
--- a/src/libs/LibSchnorr.sol
+++ b/src/libs/LibSchnorr.sol
@@ -78,8 +78,8 @@ library LibSchnorr {
             v = pubKey.yParity() + 27;
         }
 
-        // Set r = Pₓ
-        uint r = pubKey.x;
+        // Set r = Pₓ % Q
+        uint r = pubKey.x % LibSecp256k1.Q();
 
         // Compute s = Q - (e * Pₓ) (mod Q)
         //