diff --git a/libexec/rtld-elf/sparc64/rtld_machdep.h b/libexec/rtld-elf/sparc64/rtld_machdep.h
index db2ce256c6cb..155675842660 100644
--- a/libexec/rtld-elf/sparc64/rtld_machdep.h
+++ b/libexec/rtld-elf/sparc64/rtld_machdep.h
@@ -37,7 +37,7 @@
 struct Struct_Obj_Entry;
 
 /* Return the address of the .dynamic section in the dynamic linker. */
-Elf_Dyn *rtld_dynamic_addr();
+Elf_Dyn *rtld_dynamic_addr(void);
 #define	rtld_dynamic(obj)	rtld_dynamic_addr()
 #define	RTLD_IS_DYNAMIC()	(rtld_dynamic_addr() != NULL)