diff --git a/apex/prebuilt.go b/apex/prebuilt.go
index 68f2859..8c7e64c 100644
--- a/apex/prebuilt.go
+++ b/apex/prebuilt.go
@@ -152,14 +152,17 @@
 		src = String(p.Arch.X86.Src)
 	case android.X86_64:
 		src = String(p.Arch.X86_64.Src)
-	default:
-		ctx.OtherModuleErrorf(prebuilt, "prebuilt_apex does not support %q", multiTargets[0].Arch.String())
-		return nil
 	}
 	if src == "" {
 		src = String(p.Src)
 	}
 
+	if src == "" {
+		ctx.OtherModuleErrorf(prebuilt, "prebuilt_apex does not support %q", multiTargets[0].Arch.String())
+		// Drop through to return an empty string as the src (instead of nil) to avoid the prebuilt
+		// logic from reporting a more general, less useful message.
+	}
+
 	return []string{src}
 }