diff --git a/sys/sparc64/include/signal.h b/sys/sparc64/include/signal.h
index 753077c17b2..c27ad575ff7 100644
--- a/sys/sparc64/include/signal.h
+++ b/sys/sparc64/include/signal.h
@@ -46,7 +46,7 @@ typedef	long sig_atomic_t;
 #define	MINSIGSTKSZ	(1024 * 4)
 #endif
 
-#if _KERNEL
+#ifdef _KERNEL
 typedef	int osigset_t;
 
 struct osigcontext {