diff --git a/Test/Environment.lean b/Test/Environment.lean
index af98c10..b646279 100644
--- a/Test/Environment.lean
+++ b/Test/Environment.lean
@@ -106,8 +106,8 @@ def test_symbol_location : TestT IO Unit := do
     let .ok result ← Environment.inspect { name := "Nat.le_of_succ_le", source? := .some true } (options := {}) | fail "Inspect failed"
     checkEq "module" result.module? <| .some "Init.Data.Nat.Basic"
 
-    -- Doesn't work for symbols in `Init` for some reason
-    --checkEq "file" result.sourceUri? <| .some "??"
+    -- Extraction of source doesn't work for symbols in `Init` for some reason
+    checkTrue "file" result.sourceUri?.isNone
     checkEq "pos" (result.sourceStart?.map (·.column)) <| .some 0
     checkEq "pos" (result.sourceEnd?.map (·.column)) <| .some 88