diff --git a/src/fd/create.cpp b/src/fd/create.cpp
index d9b90f0..e39965f 100644
--- a/src/fd/create.cpp
+++ b/src/fd/create.cpp
@@ -11,11 +11,11 @@
 namespace fd
 {
 
-DupableFd open(const char* pathname, OpenFlags flags, mode_t mode)
+DupableFd open(const_zstring pathname, OpenFlags flags, mode_t mode)
 {
     return DupableFd(
-        CHECK_ERRNO(::open(pathname, static_cast<int>(flags), mode),
-                    std::format("open `{}`", pathname)));
+        CHECK_ERRNO(::open(pathname.c_str(), static_cast<int>(flags), mode),
+                    std::format("open `{}`", pathname.c_str())));
 }
 
 DupableFd socket(SocketDomain domain, SocketType type, SocketProto protocol)