diff --git a/include/asm-m32r/thread_info.h b/include/asm-m32r/thread_info.h
index 7a6be77..0f58936 100644
--- a/include/asm-m32r/thread_info.h
+++ b/include/asm-m32r/thread_info.h
@@ -95,7 +95,7 @@
 }
 
 /* thread information allocation */
-#if CONFIG_DEBUG_STACK_USAGE
+#ifdef CONFIG_DEBUG_STACK_USAGE
 #define alloc_thread_info(tsk)					\
 	({							\
 		struct thread_info *ret;			\