diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
index 9761bc8..5d1cfc2 100644
--- a/linker/linker_phdr.h
+++ b/linker/linker_phdr.h
@@ -119,7 +119,7 @@
                                  ElfW(Addr) load_bias);
 
 int phdr_table_serialize_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count,
-                                   ElfW(Addr) load_bias, int fd);
+                                   ElfW(Addr) load_bias, int fd, size_t* file_offset);
 
 int phdr_table_map_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count,
                              ElfW(Addr) load_bias, int fd, size_t* file_offset);