diff --git a/apex/apex.go b/apex/apex.go
index 67b1f27..c714771 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -450,7 +450,11 @@
 }
 
 func (a *apexBundle) Srcs() android.Paths {
-	return android.Paths{a.outputFiles[imageApex]}
+	if file, ok := a.outputFiles[imageApex]; ok {
+		return android.Paths{file}
+	} else {
+		return nil
+	}
 }
 
 func (a *apexBundle) installable() bool {