diff --git a/src/system/kernel/cache/block_cache.cpp b/src/system/kernel/cache/block_cache.cpp
index 662091a010..8acdd5304d 100644
--- a/src/system/kernel/cache/block_cache.cpp
+++ b/src/system/kernel/cache/block_cache.cpp
@@ -162,7 +162,7 @@ struct cache_transaction {
 	bigtime_t		last_used;
 };
 
-#ifdef BLOCK_CACHE_TRANSACTION_TRACING
+#if BLOCK_CACHE_TRANSACTION_TRACING
 namespace TransactionTracing {
 
 class Action : public AbstractTraceEntry {