diff --git a/src/aarch64/ffi.c b/src/aarch64/ffi.c
index 32eb1d7e..3534fba5 100644
--- a/src/aarch64/ffi.c
+++ b/src/aarch64/ffi.c
@@ -880,6 +880,9 @@ ffi_prep_closure_loc (ffi_closure* closure,
    value back into the call context.  */
 
 void
+ffi_closure_SYSV_inner (ffi_closure *closure, struct call_context *context,
+	  void *stack);
+void
 ffi_closure_SYSV_inner (ffi_closure *closure, struct call_context *context,
 			void *stack)
 {