Index: src/libcfa/concurrency/kernel.c
===================================================================
--- src/libcfa/concurrency/kernel.c	(revision c29c342a8a1e3215a616f162b70f85a609117410)
+++ src/libcfa/concurrency/kernel.c	(revision 3b2b37f2005f0335e652c16b01b2ebacd4c47a7e)
@@ -833,7 +833,9 @@
 // Debug
 __cfaabi_dbg_debug_do(
-	void __cfaabi_dbg_record(__spinlock_t & this, const char * prev_name) {
-		this.prev_name = prev_name;
-		this.prev_thrd = kernelTLS.this_thread;
+	extern "C" {
+		void __cfaabi_dbg_record(__spinlock_t & this, const char * prev_name) {
+			this.prev_name = prev_name;
+			this.prev_thrd = kernelTLS.this_thread;
+		}
 	}
 )