1 files changed, 7 insertions, 1 deletions
diff --git a/test/mkmf/test_sizeof.rb b/test/mkmf/test_sizeof.rb
index d35811f3f6..a44e609c06 100644
--- a/test/mkmf/test_sizeof.rb
+++ b/test/mkmf/test_sizeof.rb
@@ -2,7 +2,13 @@ require_relative 'base'
 
 class TestMkmf
   class TestSizeof < TestMkmf
-    def test_sizeof
+    def test_sizeof_builtin
+      %w[char short int long float double void*].each do |type|
+        assert_kind_of(Integer, mkmf {check_sizeof(type)})
+      end
+    end
+
+    def test_sizeof_struct
       open("confdefs.h", "w") {|f|
         f.puts "typedef struct {char x;} test1_t;"
       }