diff --git a/src/fuse_ioctl.cpp b/src/fuse_ioctl.cpp
index 6f480221..0a8f434f 100644
--- a/src/fuse_ioctl.cpp
+++ b/src/fuse_ioctl.cpp
@@ -44,6 +44,9 @@ typedef char IOCTL_BUF[4096];
 #define IOCTL_APP_TYPE  0xDF
 #define IOCTL_FILE_INFO _IOWR(IOCTL_APP_TYPE,0,IOCTL_BUF)
 
+// From linux/btrfs.h
+#define BTRFS_IOCTL_MAGIC 0x94
+
 #ifndef FS_IOC_GETFLAGS
 # define FS_IOC_GETFLAGS _IOR('f',1,long)
 #endif
@@ -314,6 +317,13 @@ namespace l
     return (_IOC_TYPE(cmd_) == IOCTL_APP_TYPE);
   }
 
+  static
+  bool
+  is_btrfs_ioctl_cmd(const unsigned long cmd_)
+  {
+    return (_IOC_TYPE(cmd_) == BTRFS_IOCTL_MAGIC);
+  }
+
   static
   int
   ioctl_custom(const fuse_file_info_t *ffi_,
@@ -340,6 +350,8 @@ namespace FUSE
         void                   *data_,
         uint32_t               *out_bufsz_)
   {
+    if(l::is_btrfs_ioctl_cmd(cmd_))
+      return -ENOTTY;
     if(l::is_mergerfs_ioctl_cmd(cmd_))
       return l::ioctl_custom(ffi_,cmd_,data_);