diff --git a/include/gcc/ck_pr.h b/include/gcc/ck_pr.h
index 83fdcfe..6ebadd8 100644
--- a/include/gcc/ck_pr.h
+++ b/include/gcc/ck_pr.h
@@ -128,6 +128,8 @@ CK_PR_FENCE(store)
 CK_PR_FENCE(store_store)
 CK_PR_FENCE(store_load)
 CK_PR_FENCE(memory)
+CK_PR_FENCE(acquire)
+CK_PR_FENCE(release)
 
 #undef CK_PR_FENCE