diff --git a/build/moz.configure/rust.configure b/build/moz.configure/rust.configure
index cd77d72bb77b..b9d24654f89b 100644
--- a/build/moz.configure/rust.configure
+++ b/build/moz.configure/rust.configure
@@ -699,6 +699,8 @@ def cargo_incremental(
 
     if not enabled:
         return "0"
+    elif enabled.origin != "default":
+        return "1"
 
     # We never want to use incremental compilation in automation.  sccache
     # handles our automation use case much better than incremental compilation