diff --git a/glib.supp b/glib.supp
index ccfab67d6..e3ce6bc49 100644
--- a/glib.supp
+++ b/glib.supp
@@ -232,6 +232,16 @@
 	fun:_g_io_module_get_default
 }
 
+# memcheck checks that the third argument to ioctl() is a valid pointer, but
+# some ioctls use that argument as an integer
+{
+   ioctl-with-non-pointer-param
+   Memcheck:Param
+   ioctl(generic)
+   fun:ioctl
+   fun:btrfs_reflink_with_progress
+}
+
 {
 	g-private-get
 	drd:ConflictingAccess