diff --git a/tests/clpy_tests/opencl_tests/ultima_tests/test_half.py b/tests/clpy_tests/opencl_tests/ultima_tests/test_half.py
index 93f8a854c09..a7e860f91e6 100644
--- a/tests/clpy_tests/opencl_tests/ultima_tests/test_half.py
+++ b/tests/clpy_tests/opencl_tests/ultima_tests/test_half.py
@@ -10,21 +10,35 @@
 class TestUltimaHalfTrick(unittest.TestCase):
 
     def test_type_half(self):
-        x = '''
+        supports_cl_khr_fp16 = clpy.backend.opencl.env.supports_cl_khr_fp16()
+        options = ('-D__CLPY_ENABLE_CL_KHR_FP16'
+                   if supports_cl_khr_fp16
+                   else '', )
+        x = clpy.backend.ultima.exec_ultima('',
+                                            '#include <cupy/carray.hpp>',
+                                            _options=options) + ('''
 __clpy__half f() 
 {
-    __clpy__half a;
-    return (__clpy__half)(42.F);
+    __clpy__half a = 42.F;
+    return a;
 }
-'''
+''' if supports_cl_khr_fp16 else '''
+__clpy__half f() 
+{
+    __clpy__half a;constructor___clpy__half___left_paren____clpy__half_float__right_paren__(&a, 42.F);
+    return a;
+}
+''')[1:]
         y = clpy.backend.ultima.exec_ultima(
             '''
             half f(){
-              half a;
-              return static_cast<half>(42.f);
+              half a = 42.f;
+              return a;
             }
-            ''')
-        self.assertEqual(x[1:], y)
+            ''',
+            '#include <cupy/carray.hpp>',
+            _options=options)
+        self.assertEqual(x, y)
 
     def test_variable_named_half(self):
         x = '''
@@ -54,21 +68,35 @@ def test_argument_named_half(self):
         self.assertEqual(x[1:], y)
 
     def test_clpy_half(self):
-        x = '''
+        supports_cl_khr_fp16 = clpy.backend.opencl.env.supports_cl_khr_fp16()
+        options = ('-D__CLPY_ENABLE_CL_KHR_FP16'
+                   if supports_cl_khr_fp16
+                   else '', )
+        x = clpy.backend.ultima.exec_ultima('',
+                                            '#include <cupy/carray.hpp>',
+                                            _options=options) + ('''
 void f() 
 {
     __clpy__half half_ = 42.F;
     int __clpy__half = half_;
 }
-'''
+''' if supports_cl_khr_fp16 else '''
+void f() 
+{
+    __clpy__half half_;constructor___clpy__half___left_paren____clpy__half_float__right_paren__(&half_, 42.F);
+    int __clpy__half = operatorfloat___clpy__half_(&half_);
+}
+''')[1:]
         y = clpy.backend.ultima.exec_ultima(
             '''
             void f(){
               __clpy__half half_ = 42.f;
               int __clpy__half = half_;
             }
-            ''')
-        self.assertEqual(x[1:], y)
+            ''',
+            '#include <cupy/carray.hpp>',
+            _options=options)
+        self.assertEqual(x, y)
 
 
 if __name__ == "__main__":