diff --git a/kernel/threading.cc b/kernel/threading.cc
index a49ee7d4e..a334dfa4c 100644
--- a/kernel/threading.cc
+++ b/kernel/threading.cc
@@ -66,11 +66,11 @@ ThreadPool::ThreadPool(int pool_size, std::function<void(int)> b)
 	: body(std::move(b))
 {
 #ifdef YOSYS_ENABLE_THREADS
-        threads.reserve(pool_size);
-        for (int i = 0; i < pool_size; i++)
-                threads.emplace_back([i, this]{ body(i); });
+	threads.reserve(pool_size);
+	for (int i = 0; i < pool_size; i++)
+		threads.emplace_back([i, this]{ body(i); });
 #else
-        (void)pool_size;
+	(void)pool_size;
 #endif
 }
 
diff --git a/tests/unit/kernel/threadingTest.cc b/tests/unit/kernel/threadingTest.cc
index cbab4d118..4e204fc61 100644
--- a/tests/unit/kernel/threadingTest.cc
+++ b/tests/unit/kernel/threadingTest.cc
@@ -109,8 +109,10 @@ TEST_F(ThreadingTest, IntRangeIteration) {
 
 TEST_F(ThreadingTest, IntRangeEmpty) {
 	IntRange range{5, 5};
-	for (int _ : range)
+	for (int _ : range) {
+		(void)_;
 		FAIL();
+	}
 }
 
 TEST_F(ThreadingTest, ItemRangeForWorker) {