diff --git a/src/lake/tests/noBuild/test.sh b/src/lake/tests/noBuild/test.sh
index 94f1e5cf3c..504a907aab 100755
--- a/src/lake/tests/noBuild/test.sh
+++ b/src/lake/tests/noBuild/test.sh
@@ -18,7 +18,7 @@ $LAKE print-paths Test --no-build
 
 # Test `--no-build` for file builds (`buildFileUnlessUpToDate`)
 $LAKE build +Test:o --no-build && exit 1 || [ $? = $NO_BUILD_CODE ]
-test ! -f build/ir/Test.o
+test ! -f build/ir/Test.c.o
 $LAKE build +Test:o
-test -f build/ir/Test.o
+test -f build/ir/Test.c.o
 $LAKE build +Test:o --no-build