diff --git a/MagickCore/magick.c b/MagickCore/magick.c
index d06d9da..b5d6c58 100644
--- a/MagickCore/magick.c
+++ b/MagickCore/magick.c
@@ -1444,6 +1444,8 @@
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",magick_info->name);
if (magick_list == (SplayTreeInfo *) NULL)
return((MagickInfo *) NULL);
+ if (magick_info->thread_support == NoThreadSupport)
+ magick_info->semaphore=AcquireSemaphoreInfo();
status=AddValueToSplayTree(magick_list,magick_info->name,magick_info);
if (status == MagickFalse)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");