diff --git a/src/cmd/cgo/gcc.go b/src/cmd/cgo/gcc.go
index 84cd2e816a..3ee4461352 100644
--- a/src/cmd/cgo/gcc.go
+++ b/src/cmd/cgo/gcc.go
@@ -1009,7 +1009,7 @@ func (p *Package) rewriteRef(f *File) {
 			if r.Name.Kind == "var" {
 				expr = &ast.StarExpr{Star: (*r.Expr).Pos(), X: expr}
 			} else {
-				error_(r.Pos(), "only C variables allowed in selector expression", fixGo(r.Name.Go))
+				error_(r.Pos(), "only C variables allowed in selector expression %s", fixGo(r.Name.Go))
 			}
 
 		case "type":