diff --git a/mjit.c b/mjit.c
index c5fb709d92..5668b1a6e9 100644
--- a/mjit.c
+++ b/mjit.c
@@ -1137,7 +1137,8 @@ convert_unit_to_func(struct rb_mjit_unit *unit)
 #else
     /* splitting .c -> .o step and .o -> .so step, to cache .o files in the future */
     if (success = compile_c_to_o(c_file, o_file)) {
-        const char *o_files[] = { o_file, NULL };
+        const char *o_files[2] = { NULL, NULL };
+        o_files[0] = o_file;
         success = link_o_to_so(o_files, so_file);
 
         /* Alwasy set o_file for compaction. The value is also used for lazy deletion. */