diff --git a/gdb/defs.h b/gdb/defs.h
index 996c8fcbcb..88e9c2ee78 100644
--- a/gdb/defs.h
+++ b/gdb/defs.h
@@ -372,6 +372,7 @@ extern CORE_ADDR host_pointer_to_address (void *ptr);
 extern void *address_to_host_pointer (CORE_ADDR addr);
 
 extern char *gdb_realpath (const char *);
+extern char *xfullpath (const char *);
 
 /* From demangle.c */