diff --git a/wand/deprecate.c b/wand/deprecate.c
index ba6e533..c17e594 100644
--- a/wand/deprecate.c
+++ b/wand/deprecate.c
@@ -96,8 +96,8 @@
images->filename);
(void) ResetMagickMemory(clone_wand,0,sizeof(*clone_wand));
clone_wand->id=AcquireWandId();
- (void) FormatMagickString(clone_wand->name,MaxTextExtent,"%s-%lu",
- MagickWandId,(unsigned long) clone_wand->id);
+ (void) FormatMagickString(clone_wand->name,MaxTextExtent,"%s-%.20g",
+ MagickWandId,(double) clone_wand->id);
clone_wand->exception=AcquireExceptionInfo();
InheritException(clone_wand->exception,wand->exception);
clone_wand->image_info=CloneImageInfo(wand->image_info);