diff --git a/crates/utils/src/envs.rs b/crates/utils/src/envs.rs
index 74607f855..9316577c4 100644
--- a/crates/utils/src/envs.rs
+++ b/crates/utils/src/envs.rs
@@ -686,6 +686,28 @@ mod tests {
         assert_eq!(report.conflict_count(), 0);
     }
 
+    #[test]
+    fn scanner_aliases_are_mapped_when_rustfs_missing() {
+        let report = build_external_env_compat_report_from_entries(vec![
+            (source_key("SCANNER_SPEED"), "slow".to_string()),
+            (source_key("SCANNER_CYCLE"), "600".to_string()),
+        ]);
+        assert_eq!(report.mapped_count(), 2);
+        assert!(
+            report
+                .mapped_pairs
+                .iter()
+                .any(|(input_key, rustfs_key)| input_key == &source_key("SCANNER_SPEED") && rustfs_key == "RUSTFS_SCANNER_SPEED")
+        );
+        assert!(
+            report
+                .mapped_pairs
+                .iter()
+                .any(|(input_key, rustfs_key)| input_key == &source_key("SCANNER_CYCLE") && rustfs_key == "RUSTFS_SCANNER_CYCLE")
+        );
+        assert_eq!(report.conflict_count(), 0);
+    }
+
     #[test]
     fn rustfs_value_takes_precedence_on_conflict() {
         let report = build_external_env_compat_report_from_entries(vec![