diff --git a/test_conformance/half/cl_utils.c b/test_conformance/half/cl_utils.c
index 81a21158..457cfaa3 100644
--- a/test_conformance/half/cl_utils.c
+++ b/test_conformance/half/cl_utils.c
@@ -453,7 +453,7 @@ size_t getBufferSize(cl_device_id device_id)
         }
         if (result > BUFFER_SIZE)
             result = BUFFER_SIZE;
-        log_info("Using const buffer size 0x%lx (%ld)\n", (unsigned long)result, (unsigned long)result);
+        log_info("Using const buffer size 0x%lx (%lu)\n", (unsigned long)result, (unsigned long)result);
         err = clGetDeviceInfo (device_id,
                                CL_DEVICE_GLOBAL_MEM_SIZE,
                                sizeof(maxGlobalSize), (void *)&maxGlobalSize,