diff --git a/mockgen/parse.go b/mockgen/parse.go
index 9c5475e9..d25e3ce5 100644
--- a/mockgen/parse.go
+++ b/mockgen/parse.go
@@ -47,7 +47,7 @@ func parseFile(source string) (*model.Package, error) {
 		return nil, fmt.Errorf("failed getting source directory: %v", err)
 	}
 
-	cfg := &packages.Config{Mode: packages.LoadSyntax, Tests: true}
+	cfg := &packages.Config{Mode: packages.LoadFiles, Tests: true, Dir: srcDir}
 	pkgs, err := packages.Load(cfg, "file="+source)
 	if err != nil {
 		return nil, err