diff --git a/include/bl_common.h b/include/bl_common.h
index 8139282..ba6dc11 100644
--- a/include/bl_common.h
+++ b/include/bl_common.h
@@ -133,6 +133,7 @@
 extern void init_bl31_mem_layout(const meminfo *,
 				 meminfo *,
 				 unsigned int) __attribute__((weak));
+extern unsigned long image_size(const char *);
 extern unsigned long load_image(meminfo *, const char *, unsigned int, unsigned long);
 extern void __dead2 run_image(unsigned long entrypoint,
 			      unsigned long spsr,