diff --git a/rts/sm/HeapAlloc.h b/rts/sm/HeapAlloc.h
index b9f7c468be714154ef709f734827aaf151fc2c05..32210d12974d3d5307e21000dc6daab841cb60c7 100644
--- a/rts/sm/HeapAlloc.h
+++ b/rts/sm/HeapAlloc.h
@@ -10,6 +10,14 @@
 
 #include "BeginPrivate.h"
 
+#if defined(THREADED_RTS)
+// needed for HEAP_ALLOCED below
+extern SpinLock gc_alloc_block_sync;
+#endif
+
+#define ACQUIRE_ALLOC_BLOCK_SPIN_LOCK() ACQUIRE_SPIN_LOCK(&gc_alloc_block_sync)
+#define RELEASE_ALLOC_BLOCK_SPIN_LOCK() RELEASE_SPIN_LOCK(&gc_alloc_block_sync)
+
 /* -----------------------------------------------------------------------------
    The HEAP_ALLOCED() test.
 
diff --git a/rts/sm/Storage.h b/rts/sm/Storage.h
index c6046de2c0b6ed0a3b0741cf89e63deb6ebce9f3..9c86abfc2bf93bcc9a949c3b072a64ed4a8999f1 100644
--- a/rts/sm/Storage.h
+++ b/rts/sm/Storage.h
@@ -43,15 +43,6 @@ extern Mutex sm_mutex;
 #define ASSERT_SM_LOCK()
 #endif
 
-#if defined(THREADED_RTS)
-// needed for HEAP_ALLOCED below
-extern SpinLock gc_alloc_block_sync;
-#endif
-
-#define ACQUIRE_ALLOC_BLOCK_SPIN_LOCK() ACQUIRE_SPIN_LOCK(&gc_alloc_block_sync)
-#define RELEASE_ALLOC_BLOCK_SPIN_LOCK() RELEASE_SPIN_LOCK(&gc_alloc_block_sync)
-
-
 /* -----------------------------------------------------------------------------
    The write barrier for MVARs and TVARs
    -------------------------------------------------------------------------- */