diff --git a/src/go/types/resolver.go b/src/go/types/resolver.go
index 1536df5bf1..992188f0ff 100644
--- a/src/go/types/resolver.go
+++ b/src/go/types/resolver.go
@@ -67,7 +67,7 @@ func (check *Checker) arityMatch(s, init *ast.ValueSpec) {
 			// TODO(gri) avoid declared but not used error here
 		} else {
 			// init exprs "inherited"
-			check.errorf(s.Pos(), "extra init expr at %s", init.Pos())
+			check.errorf(s.Pos(), "extra init expr at %s", check.fset.Position(init.Pos()))
 			// TODO(gri) avoid declared but not used error here
 		}
 	case l > r && (init != nil || r != 1):
diff --git a/src/go/types/stmt.go b/src/go/types/stmt.go
index e301f71159..5764430b1b 100644
--- a/src/go/types/stmt.go
+++ b/src/go/types/stmt.go
@@ -123,7 +123,7 @@ func (check *Checker) multipleDefaults(list []ast.Stmt) {
 		}
 		if d != nil {
 			if first != nil {
-				check.errorf(d.Pos(), "multiple defaults (first at %s)", first.Pos())
+				check.errorf(d.Pos(), "multiple defaults (first at %s)", check.fset.Position(first.Pos()))
 			} else {
 				first = d
 			}