diff --git a/src/cmd/link/internal/ld/dwarf.go b/src/cmd/link/internal/ld/dwarf.go
index e108048827..dcbe719c96 100644
--- a/src/cmd/link/internal/ld/dwarf.go
+++ b/src/cmd/link/internal/ld/dwarf.go
@@ -1140,9 +1140,7 @@ func (d *dwctxt) importInfoSymbol(dsym loader.Sym) {
 }
 
 func expandFile(fname string) string {
-	if strings.HasPrefix(fname, src.FileSymPrefix) {
-		fname = fname[len(src.FileSymPrefix):]
-	}
+	fname = strings.TrimPrefix(fname, src.FileSymPrefix)
 	return expandGoroot(fname)
 }