diff --git a/apex/prebuilt.go b/apex/prebuilt.go
index 20a13c3..65278c9 100644
--- a/apex/prebuilt.go
+++ b/apex/prebuilt.go
@@ -516,7 +516,7 @@
 	// This cannot be marked as `android:"arch_variant"` because the `prebuilt_apex` is only mutated
 	// for android_common. That is so that it will have the same arch variant as, and so be compatible
 	// with, the source `apex` module type that it replaces.
-	Src  *string `android:"path"`
+	Src  proptools.Configurable[string] `android:"path,replace_instead_of_append"`
 	Arch struct {
 		Arm struct {
 			Src *string `android:"path"`
@@ -566,7 +566,7 @@
 		src = String(p.Arch.X86_64.Src)
 	}
 	if src == "" {
-		src = String(p.Src)
+		src = p.Src.GetOrDefault(ctx, "")
 	}
 
 	if src == "" {