diff --git a/src/fuse_open.cpp b/src/fuse_open.cpp
index d96c1026..9bd9f9e8 100644
--- a/src/fuse_open.cpp
+++ b/src/fuse_open.cpp
@@ -263,7 +263,7 @@ namespace l
 
 constexpr
 uint64_t
-combine(PassthroughEnum e,
+_(PassthroughEnum e,
         uint64_t        m)
 {
   return ((((uint64_t)e) << 32) | (m & O_ACCMODE));