diff --git a/MagickCore/delegate.h b/MagickCore/delegate.h
index 41b5c16..b029c18 100644
--- a/MagickCore/delegate.h
+++ b/MagickCore/delegate.h
@@ -60,6 +60,10 @@
*GetDelegateInfo(const char *,const char *,ExceptionInfo *exception),
**GetDelegateInfoList(const char *,size_t *,ExceptionInfo *);
+extern MagickExport int
+ ExternalDelegateCommand(const MagickBooleanType,const MagickBooleanType,
+ const char *,char *,ExceptionInfo *);
+
extern MagickExport ssize_t
GetDelegateMode(const DelegateInfo *);