diff --git a/ci/test-stable.sh b/ci/test-stable.sh
index 8986b0e486..c4d51acb44 100755
--- a/ci/test-stable.sh
+++ b/ci/test-stable.sh
@@ -70,7 +70,7 @@ test-stable-perf)
 
   # Run root package library tests
   _ cargo +"$rust_stable" build --all ${V:+--verbose} --features="$ROOT_FEATURES"
-  _ cargo +"$rust_stable" test --all ${V:+--verbose} --features="$ROOT_FEATURES" -- --nocapture --test-threads=1
+  _ cargo +"$rust_stable" test --manifest-path=core/Cargo.toml ${V:+--verbose} --features="$ROOT_FEATURES" -- --nocapture --test-threads=1
   ;;
 *)
   echo "Error: Unknown test: $testName"