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 *);