diff --git a/glib/glib-private.h b/glib/glib-private.h
index 3417dfaf6..4dd0c2020 100644
--- a/glib/glib-private.h
+++ b/glib/glib-private.h
@@ -100,7 +100,7 @@ g_leak_sanitizer_is_supported (void)
 #if defined (_GLIB_ADDRESS_SANITIZER)
   return TRUE;
 #elif defined (HAS_DYNAMIC_ASAN_LOADING)
-  return __lsan_enable != NULL && __lsan_ignore_object != NULL;
+  return G_UNLIKELY (__lsan_enable != NULL && __lsan_ignore_object != NULL);
 #else
   return FALSE;
 #endif
@@ -122,7 +122,7 @@ g_ignore_leak (gconstpointer p)
   if (p != NULL)
     __lsan_ignore_object (p);
 #elif defined (HAS_DYNAMIC_ASAN_LOADING)
-  if (p != NULL && __lsan_ignore_object != NULL)
+  if (G_LIKELY (p != NULL) && G_UNLIKELY (__lsan_ignore_object != NULL))
     __lsan_ignore_object (p);
 #endif
 }
@@ -166,7 +166,7 @@ g_begin_ignore_leaks (void)
 #if defined (_GLIB_ADDRESS_SANITIZER)
   __lsan_disable ();
 #elif defined (HAS_DYNAMIC_ASAN_LOADING)
-  if (__lsan_disable != NULL)
+  if (G_UNLIKELY (__lsan_disable != NULL))
     __lsan_disable ();
 #endif
 }
@@ -183,7 +183,7 @@ g_end_ignore_leaks (void)
 #if defined (_GLIB_ADDRESS_SANITIZER)
   __lsan_enable ();
 #elif defined (HAS_DYNAMIC_ASAN_LOADING)
-  if (__lsan_enable != NULL)
+  if (G_UNLIKELY (__lsan_enable != NULL))
     __lsan_enable ();
 #endif
 }