diff --git a/android/module.go b/android/module.go
index 14b9f41..9de5294 100644
--- a/android/module.go
+++ b/android/module.go
@@ -110,6 +110,7 @@
 
 	ExpandSources(srcFiles, excludes []string) Paths
 	ExpandSource(srcFile, prop string) Path
+	ExpandOptionalSource(srcFile *string, prop string) OptionalPath
 	ExpandSourcesSubDir(srcFiles, excludes []string, subDir string) Paths
 	Glob(globPattern string, excludes []string) Paths
 
@@ -1162,6 +1163,16 @@
 	}
 }
 
+// Returns an optional single path expanded from globs and modules referenced using ":module" syntax if
+// the srcFile is non-nil.
+// ExtractSourceDeps must have already been called during the dependency resolution phase.
+func (ctx *androidModuleContext) ExpandOptionalSource(srcFile *string, prop string) OptionalPath {
+	if srcFile != nil {
+		return OptionalPathForPath(ctx.ExpandSource(*srcFile, prop))
+	}
+	return OptionalPath{}
+}
+
 func (ctx *androidModuleContext) ExpandSourcesSubDir(srcFiles, excludes []string, subDir string) Paths {
 	prefix := PathForModuleSrc(ctx).String()