diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
index 65d302c..6b917b4 100644
--- a/linker/linker_phdr.h
+++ b/linker/linker_phdr.h
@@ -98,7 +98,7 @@
 
 #if defined(__arm__)
 int phdr_table_get_arm_exidx(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias,
-                             ElfW(Addr)** arm_exidx, unsigned* arm_exidix_count);
+                             ElfW(Addr)** arm_exidx, size_t* arm_exidix_count);
 #endif
 
 void phdr_table_get_dynamic_section(const ElfW(Phdr)* phdr_table, size_t phdr_count,