diff --git a/src/config.hpp b/src/config.hpp
index 0df616cf..39b6280a 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -124,7 +124,7 @@ public:
   NFSOpenHack    nfsopenhack;
   ConfigBOOL     nullrw;
   Passthrough    passthrough = Passthrough::ENUM::OFF;
-  ConfigINT      passthrough_max_stack_depth = 1;
+  ConfigUINT32   passthrough_max_stack_depth = 1;
   ConfigBOOL     parallel_direct_writes;
   ConfigGetPid   pid;
   ConfigBOOL     posix_acl;