diff --git a/android/testing.go b/android/testing.go
index 92ce014..470cfd6 100644
--- a/android/testing.go
+++ b/android/testing.go
@@ -469,6 +469,9 @@
 //
 // The build and source paths should be distinguishable based on their contents.
 func NormalizePathForTesting(path Path) string {
+	if path == nil {
+		return "<nil path>"
+	}
 	p := path.String()
 	// Allow absolute paths to /dev/
 	if strings.HasPrefix(p, "/dev/") {