diff --git a/ChangeLog b/ChangeLog
index 633a60b3..5bb77d84 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,6 @@
 25/3/17 started 8.5.2
 - better behaviour for truncated PNG files, thanks Yury
+- missing proto for vips_tiffsave_buffer(), thanks greut
 
 25/3/17 started 8.5.1
 - init more classes earlier, thanks David
diff --git a/libvips/include/vips/foreign.h b/libvips/include/vips/foreign.h
index f5ef933c..c77a7f37 100644
--- a/libvips/include/vips/foreign.h
+++ b/libvips/include/vips/foreign.h
@@ -443,6 +443,8 @@ int vips_tiffload_buffer( void *buf, size_t len, VipsImage **out, ... )
 	__attribute__((sentinel));
 int vips_tiffsave( VipsImage *in, const char *filename, ... )
 	__attribute__((sentinel));
+int vips_tiffsave_buffer( VipsImage *in, void **buf, size_t *len, ... )
+	__attribute__((sentinel));
 
 int vips_openexrload( const char *filename, VipsImage **out, ... )
 	__attribute__((sentinel));