diff --git a/MagickCore/channel.h b/MagickCore/channel.h
index 76c8185..bb3e89d 100644
--- a/MagickCore/channel.h
+++ b/MagickCore/channel.h
@@ -23,7 +23,14 @@
#endif
extern MagickExport Image
- *ChannelOperationImage(const Image *,const char *,ExceptionInfo *);
+ *ChannelOperationImage(const Image *,const char *,ExceptionInfo *),
+ *CombineImages(const Image *,ExceptionInfo *),
+ *SeparateImage(const Image *,const ChannelType,ExceptionInfo *),
+ *SeparateImages(const Image *,ExceptionInfo *);
+
+extern MagickExport MagickBooleanType
+ GetImageAlphaChannel(const Image *),
+ SetImageAlphaChannel(Image *,const AlphaChannelType,ExceptionInfo *);
#if defined(__cplusplus) || defined(c_plusplus)
}