diff --git a/glib/gthread-posix.c b/glib/gthread-posix.c
index 02b944f6d..110263037 100644
--- a/glib/gthread-posix.c
+++ b/glib/gthread-posix.c
@@ -82,10 +82,6 @@ g_mutex_lock (GMutex *mutex)
 {
   gint status;
 
-  /* temporary until we fix libglib */
-  if (mutex == NULL)
-    return;
-
   if G_UNLIKELY ((status = pthread_mutex_lock (&mutex->impl)) != 0)
     g_thread_abort (status, "pthread_mutex_lock");
 }
@@ -95,10 +91,6 @@ g_mutex_unlock (GMutex *mutex)
 {
   gint status;
 
-  /* temporary until we fix libglib */
-  if (mutex == NULL)
-    return;
-
   if G_UNLIKELY ((status = pthread_mutex_unlock (&mutex->impl)) != 0)
     g_thread_abort (status, "pthread_mutex_lock");
 }
@@ -108,10 +100,6 @@ g_mutex_trylock (GMutex *mutex)
 {
   gint status;
 
-  /* temporary until we fix libglib */
-  if (mutex == NULL)
-    return TRUE;
-
   if G_LIKELY ((status = pthread_mutex_trylock (&mutex->impl)) == 0)
     return TRUE;
 
@@ -156,10 +144,6 @@ g_cond_signal (GCond *cond)
 {
   gint status;
 
-  /* temporary until we fix libglib */
-  if (cond == NULL)
-    return;
-
   if G_UNLIKELY ((status = pthread_cond_signal (&cond->impl)) != 0)
     g_thread_abort (status, "pthread_cond_signal");
 }
@@ -169,10 +153,6 @@ g_cond_broadcast (GCond *cond)
 {
   gint status;
 
-  /* temporary until we fix libglib */
-  if (cond == NULL)
-    return;
-
   if G_UNLIKELY ((status = pthread_cond_broadcast (&cond->impl)) != 0)
     g_thread_abort (status, "pthread_cond_broadcast");
 }
diff --git a/glib/gthread-win32.c b/glib/gthread-win32.c
index d63864c7c..b826918e9 100644
--- a/glib/gthread-win32.c
+++ b/glib/gthread-win32.c
@@ -136,30 +136,18 @@ g_mutex_clear (GMutex *mutex)
 void
 g_mutex_lock (GMutex *mutex)
 {
-  /* temporary until we fix libglib */
-  if (mutex == NULL)
-    return;
-
   g_thread_impl_vtable.AcquireSRWLockExclusive (mutex);
 }
 
 gboolean
 g_mutex_trylock (GMutex *mutex)
 {
-  /* temporary until we fix libglib */
-  if (mutex == NULL)
-    return TRUE;
-
   return g_thread_impl_vtable.TryAcquireSRWLockExclusive (mutex);
 }
 
 void
 g_mutex_unlock (GMutex *mutex)
 {
-  /* temporary until we fix libglib */
-  if (mutex == NULL)
-    return;
-
   g_thread_impl_vtable.ReleaseSRWLockExclusive (mutex);
 }
 
@@ -180,20 +168,12 @@ g_cond_clear (GCond *cond)
 void
 g_cond_signal (GCond *cond)
 {
-  /* temporary until we fix libglib */
-  if (cond == NULL)
-    return;
-
   g_thread_impl_vtable.WakeConditionVariable (cond);
 }
 
 void
 g_cond_broadcast (GCond *cond)
 {
-  /* temporary until we fix libglib */
-  if (cond == NULL)
-    return;
-
   g_thread_impl_vtable.WakeAllConditionVariable (cond);
 }