diff --git a/src/config.cpp b/src/config.cpp
index 2f7c495b..7339808e 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -63,10 +63,13 @@ namespace l
     IFERT("mount");
     IFERT("nullrw");
     IFERT("pid");
+    IFERT("pin-threads");
+    IFERT("process-thread-count");
+    IFERT("read-thread-count");
     IFERT("readdirplus");
+    IFERT("scheduling-priority");
     IFERT("threads");
     IFERT("version");
-    IFERT("scheduling-priority");
 
     return false;
   }
@@ -118,9 +121,11 @@ Config::Config()
     symlinkify_timeout(3600),
     fuse_read_thread_count(-1),
     fuse_process_thread_count(-1),
+    fuse_pin_threads("false"),
     version(MERGERFS_VERSION),
     writeback_cache(false),
-    xattr(XAttr::ENUM::PASSTHROUGH)
+    xattr(XAttr::ENUM::PASSTHROUGH),
+    _initialized(false)
 {
   _map["async_read"]             = &async_read;
   _map["auto_cache"]             = &auto_cache;
@@ -176,6 +181,7 @@ Config::Config()
   _map["nfsopenhack"]            = &nfsopenhack;
   _map["nullrw"]                 = &nullrw;
   _map["pid"]                    = &pid;
+  _map["pin-threads"]            = &fuse_pin_threads;
   _map["posix_acl"]              = &posix_acl;
   _map["readahead"]              = &readahead;
   //  _map["readdir"]            = &readdir;
@@ -287,7 +293,7 @@ int
 Config::set(const std::string &key_,
             const std::string &value_)
 {
-  if(l::readonly(key_))
+  if(_initialized && l::readonly(key_))
     return -EROFS;
 
   return set_raw(key_,value_);
@@ -362,6 +368,12 @@ Config::from_file(const std::string &filepath_,
   return rv;
 }
 
+void
+Config::finish_initializing()
+{
+  _initialized = true;
+}
+
 std::ostream&
 operator<<(std::ostream &os_,
            const Config &c_)
diff --git a/src/config.hpp b/src/config.hpp
index 40b98d0a..ab2270b2 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -146,11 +146,18 @@ public:
   ConfigUINT64   symlinkify_timeout;
   ConfigINT      fuse_read_thread_count;
   ConfigINT      fuse_process_thread_count;
+  ConfigSTR      fuse_pin_threads;
   ConfigSTR      version;
   ConfigBOOL     writeback_cache;
   XAttr          xattr;
 
 
+private:
+  bool _initialized;
+
+public:
+  void finish_initializing();
+
 public:
   friend std::ostream& operator<<(std::ostream &s,
                                   const Config &c);
diff --git a/src/option_parser.cpp b/src/option_parser.cpp
index e18fe1dd..b459eb53 100644
--- a/src/option_parser.cpp
+++ b/src/option_parser.cpp
@@ -82,6 +82,7 @@ set_fuse_threads(Config::Write &cfg_,
 {
   set_kv_option("read-thread-count",cfg_->fuse_read_thread_count.to_string(),args_);
   set_kv_option("process-thread-count",cfg_->fuse_process_thread_count.to_string(),args_);
+  set_kv_option("pin-threads",cfg_->fuse_pin_threads.to_string(),args_);
 }
 
 static
@@ -135,7 +136,7 @@ should_ignore(const std::string &key_)
       "splice_move",
       "splice_read",
       "splice_write",
-      "use_ino"
+      "use_ino",
     };
 
   return (IGNORED_KEYS.find(key_) != IGNORED_KEYS.end());
@@ -431,5 +432,7 @@ namespace options
     set_fsname(cfg,args_);
     set_subtype(args_);
     set_fuse_threads(cfg,args_);
+
+    cfg->finish_initializing();
   }
 }