diff --git a/ext/-test-/num2int/num2int.c b/ext/-test-/num2int/num2int.c
index 5230896658..fb1ea9678d 100644
--- a/ext/-test-/num2int/num2int.c
+++ b/ext/-test-/num2int/num2int.c
@@ -72,13 +72,14 @@ print_num2ulong(VALUE obj, VALUE num)
     return Qnil;
 }
 
+#ifdef HAVE_LONG_LONG
 static VALUE
 print_num2ll(VALUE obj, VALUE num)
 {
     char buf[128];
     VALUE str;
 
-    sprintf(buf, "%lld", NUM2LL(num));
+    sprintf(buf, "%"PRI_LL_PREFIX"d", NUM2LL(num));
     str = rb_str_new_cstr(buf);
     rb_io_write(rb_stdout, str);
     return Qnil;
@@ -90,12 +91,12 @@ print_num2ull(VALUE obj, VALUE num)
     char buf[128];
     VALUE str;
 
-    sprintf(buf, "%llu", NUM2ULL(num));
+    sprintf(buf, "%"PRI_LL_PREFIX"u", NUM2ULL(num));
     str = rb_str_new_cstr(buf);
     rb_io_write(rb_stdout, str);
     return Qnil;
 }
-
+#endif
 
 void
 Init_num2int(void)
@@ -111,7 +112,9 @@ Init_num2int(void)
     rb_define_singleton_method(cNum2int, "print_num2long", print_num2long, 1);
     rb_define_singleton_method(cNum2int, "print_num2ulong", print_num2ulong, 1);
 
+#ifdef HAVE_LONG_LONG
     rb_define_singleton_method(cNum2int, "print_num2ll", print_num2ll, 1);
     rb_define_singleton_method(cNum2int, "print_num2ull", print_num2ull, 1);
+#endif
 }
 
diff --git a/test/-ext-/num2int/test_num2int.rb b/test/-ext-/num2int/test_num2int.rb
index 381336e0c8..b69f29a516 100644
--- a/test/-ext-/num2int/test_num2int.rb
+++ b/test/-ext-/num2int/test_num2int.rb
@@ -188,7 +188,7 @@ class TestNum2int < Test::Unit::TestCase
     assert_output((FIXNUM_MAX+1).to_s) do
       Num2int.print_num2ll(FIXNUM_MAX+1)
     end
-  end
+  end if defined?(Num2int.print_num2ll)
 
   def test_num2ull
     assert_output("0") do
@@ -221,7 +221,7 @@ class TestNum2int < Test::Unit::TestCase
     assert_output((FIXNUM_MAX+1).to_s) do
       Num2int.print_num2ull(FIXNUM_MAX+1)
     end
-  end
+  end if defined?(Num2int.print_num2ull)
 end