diff --git a/glibc-2.2.supp b/glibc-2.2.supp
index 3dbb2bb..859ed58 100644
--- a/glibc-2.2.supp
+++ b/glibc-2.2.supp
@@ -138,6 +138,7 @@
 #}
 
 #-------- Threading bugs?
+# glibc 'knows' that destroying a locked mutex will unlock it
 {
    pthread_error/__pthread_mutex_destroy/__closedir
    core:PThread
@@ -161,13 +162,6 @@
    fun:_IO_funlockfile
 }
 
-{
-   __pthread_mutex_unlock/__register_frame_info
-   core:PThread
-   fun:__pthread_mutex_unlock
-   fun:__register_frame_info
-}
-
 # even more glibc suppressions ?
 {
    libc-2.2.4.so/libc-2.2.4.so/libc-2.2.4.so(Cond)