diff --git a/src/core/package.go b/src/core/package.go
index 3786586e93..dac2270147 100644
--- a/src/core/package.go
+++ b/src/core/package.go
@@ -67,14 +67,6 @@ func (pkg *Package) TargetOrDie(name string) *BuildTarget {
 	return t
 }
 
-// SourceRoot returns the root directory of source files for this package.
-// This is equivalent to .Name for in-repo packages but differs for those in subrepos.
-func (pkg *Package) SourceRoot() string {
-	if pkg.Subrepo != nil {
-		return pkg.Subrepo.Dir(pkg.Name)
-	}
-	return pkg.Name
-}
 
 // AddTarget adds a new target to this package with the given name.
 // It doesn't check for duplicates.
diff --git a/src/parse/asp/builtins.go b/src/parse/asp/builtins.go
index b31e43c5db..f33b715710 100644
--- a/src/parse/asp/builtins.go
+++ b/src/parse/asp/builtins.go
@@ -607,10 +607,14 @@ func glob(s *scope, args []pyObject) pyObject {
 	allowEmpty := args[4].IsTruthy()
 	exclude = append(exclude, s.state.Config.Parse.BuildFileName...)
 	if s.globber == nil {
-		s.globber = fs.NewGlobber(fs.HostFS, s.state.Config.Parse.BuildFileName)
+		if s.pkg.Subrepo != nil {
+			s.globber = fs.NewGlobber(s.pkg.Subrepo.FS, s.state.Config.Parse.BuildFileName)
+		} else {
+			s.globber = fs.NewGlobber(fs.HostFS, s.state.Config.Parse.BuildFileName)
+		}
 	}
 
-	glob := s.globber.Glob(s.pkg.SourceRoot(), include, exclude, hidden, includeSymlinks)
+	glob := s.globber.Glob(s.pkg.Name, include, exclude, hidden, includeSymlinks)
 	if !allowEmpty && len(glob) == 0 {
 		// Strip build file name from exclude list for error message
 		exclude = exclude[:len(exclude)-len(s.state.Config.Parse.BuildFileName)]