diff --git a/include/gcc/x86_64/ck_pr_rtm.h b/include/gcc/x86_64/ck_pr_rtm.h
index 889efc1..aaa956b 100644
--- a/include/gcc/x86_64/ck_pr_rtm.h
+++ b/include/gcc/x86_64/ck_pr_rtm.h
@@ -98,7 +98,7 @@ ck_pr_rtm_test(void)
 
 	__asm__ __volatile__(".byte 0x0f,0x01,0xd6;"
 			     "setnz %0"
-				: "=r" (out)
+				: "=r" (r)
 				:
 				: "memory");