diff --git a/src/go/types/expr.go b/src/go/types/expr.go
index 4e19f30..eb20561 100644
--- a/src/go/types/expr.go
+++ b/src/go/types/expr.go
@@ -890,7 +890,7 @@
 			// TODO(gri) We should report exactly what went wrong. At the
 			//           moment we don't have the (go/constant) API for that.
 			//           See also TODO in go/constant/value.go.
-			check.errorf(atPos(e.OpPos), _InvalidConstVal, "constant result is not representable")
+			check.errorf(atPos(opPos), _InvalidConstVal, "constant result is not representable")
 			// TODO(gri) Should we mark operands with unknown values as invalid?
 		}
 		// Typed constants must be representable in