diff --git a/tools/imagetool.h b/tools/imagetool.h
index c2c9aea..a3e9d30 100644
--- a/tools/imagetool.h
+++ b/tools/imagetool.h
@@ -167,6 +167,7 @@
 void init_fit_image_type(void);
 void init_ubl_image_type(void);
 void init_omap_image_type(void);
+void init_gpimage_type(void);
 
 void pbl_load_uboot(int fd, struct image_tool_params *mparams);