diff --git a/contracts/Groth16Verifier.sol b/contracts/Groth16Verifier.sol
index 54565c3..cb84825 100644
--- a/contracts/Groth16Verifier.sol
+++ b/contracts/Groth16Verifier.sol
@@ -45,11 +45,6 @@ library Pairing {
     // solhint-disable-next-line no-inline-assembly
     assembly {
       success := staticcall(sub(gas(), 2000), 6, input, 0xc0, r, 0x60)
-      // Use "invalid" to make gas estimation work
-      switch success
-      case 0 {
-        invalid()
-      }
     }
     require(success, "pairing-add-failed");
   }
@@ -68,11 +63,6 @@ library Pairing {
     // solhint-disable-next-line no-inline-assembly
     assembly {
       success := staticcall(sub(gas(), 2000), 7, input, 0x80, r, 0x60)
-      // Use "invalid" to make gas estimation work
-      switch success
-      case 0 {
-        invalid()
-      }
     }
     require(success, "pairing-mul-failed");
   }
@@ -109,11 +99,6 @@ library Pairing {
         out,
         0x20
       )
-      // Use "invalid" to make gas estimation work
-      switch success
-      case 0 {
-        invalid()
-      }
     }
     require(success, "pairing-opcode-failed");
     return out[0] != 0;