diff --git a/tests/interpreter/cases/builtins/numbers/intn.yaml b/tests/interpreter/cases/builtins/numbers/intn.yaml
index 4d6ada81b..91e2aeda7 100644
--- a/tests/interpreter/cases/builtins/numbers/intn.yaml
+++ b/tests/interpreter/cases/builtins/numbers/intn.yaml
@@ -16,12 +16,16 @@ cases:
 
         results = [
           x == z[0],
-          x != y,
-          x != a,
+          x >= 0,
+          x < 50000,
+          y >= 0,
+          y < 50000,
+          a >= 0,
+          a < 25000,
           rand.intn("b", 0)
         ]
     query: data.test.results
-    want_result: [true, true, true, 0]
+    want_result: [true, true, true, true, true, true, true, 0]
 
   - note: undefined
     data: {}
diff --git a/xtask/src/tasks/bindings/ffi.rs b/xtask/src/tasks/bindings/ffi.rs
index f09531df1..b14774384 100644
--- a/xtask/src/tasks/bindings/ffi.rs
+++ b/xtask/src/tasks/bindings/ffi.rs
@@ -161,6 +161,8 @@ impl TestFfiCommand {
         }
         test_args.push(OsString::from("--features"));
         test_args.push(OsString::from("contention_checks"));
+        test_args.push(OsString::from("--"));
+        test_args.push(OsString::from("--test-threads=1"));
         run_cargo_step(
             &ffi_dir,
             "cargo test --features contention_checks (bindings/ffi)",