ruby
diff --git a/‎ext/fiddle/closure.c
Lines changed: 12 additions & 6 deletions b/‎ext/fiddle/closure.c
Lines changed: 12 additions & 6 deletions
diff --git a/‎test/fiddle/test_closure.rb
Lines changed: 12 additions & 0 deletions b/‎test/fiddle/test_closure.rb
Lines changed: 12 additions & 0 deletions
@@ -221,6 +221,7 @@ initialize(int rbargc, VALUE argv[], VALUE self)
 {
     VALUE ret;
     VALUE args;
+    VALUE normalized_args;
     VALUE abi;
     fiddle_closure * cl;
     ffi_cif * cif;
@@ -239,21 +240,26 @@ initialize(int rbargc, VALUE argv[], VALUE self)
 
     cl->argv = (ffi_type **)xcalloc(argc + 1, sizeof(ffi_type *));
 
+    normalized_args = rb_ary_new_capa(argc);
     for (i = 0; i < argc; i++) {
-        int type = NUM2INT(RARRAY_AREF(args, i));
-        cl->argv[i] = INT2FFI_TYPE(type);
+        VALUE arg = rb_fiddle_type_ensure(RARRAY_AREF(args, i));
+        rb_ary_push(normalized_args, arg);
+        cl->argv[i] = rb_fiddle_int_to_ffi_type(NUM2INT(arg));
     }
     cl->argv[argc] = NULL;
 
+    ret = rb_fiddle_type_ensure(ret);
     rb_iv_set(self, "@ctype", ret);
-    rb_iv_set(self, "@args", args);
+    rb_iv_set(self, "@args", normalized_args);
 
     cif = &cl->cif;
     pcl = cl->pcl;
 
-    result = ffi_prep_cif(cif, NUM2INT(abi), argc,
-                INT2FFI_TYPE(NUM2INT(ret)),
-		cl->argv);
+    result = ffi_prep_cif(cif,
+                          NUM2INT(abi),
+                          argc,
+                          rb_fiddle_int_to_ffi_type(NUM2INT(ret)),
+                          cl->argv);
 
     if (FFI_OK != result)
 	rb_raise(rb_eRuntimeError, "error prepping CIF %d", result);
 
@@ -20,6 +20,18 @@ def test_argument_errors
       end
     end
 
+    def test_type_symbol
+      closure = Closure.new(:int, [:void])
+      assert_equal([
+                     TYPE_INT,
+                     [TYPE_VOID],
+                   ],
+                   [
+                     closure.instance_variable_get(:@ctype),
+                     closure.instance_variable_get(:@args),
+                   ])
+    end
+
     def test_call
       closure = Class.new(Closure) {
         def call