diff --git a/include/rtdef.h b/include/rtdef.h
index 1107e3bbf657fdac433c1f769c8a7520aeecf6b4..b1d0c1abae74a4f7ba4d063d881b20fbe6864442 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -31,7 +31,7 @@ extern "C" {
 
 /*@{*/
 
-/* RT-Thread version information */
+/* RT-Thread version information */
 #define RT_VERSION                      1L      /**< major version number */
 #define RT_SUBVERSION                   1L      /**< minor version number */
 #define RT_REVISION                     0L      /**< revise version number */
@@ -150,7 +150,7 @@ typedef rt_base_t                       rt_off_t;       /**< Type for offset
 #define RT_EEMPTY                       4               /**< The resource is empty   */
 #define RT_ENOMEM                       5               /**< No memory               */
 #define RT_ENOSYS                       6               /**< No system               */
-#define RT_EBUSY                        7               /**< Busy                    */
+#define RT_EBUSY                        7               /**< Busy                    */
 #define RT_EIO							8 				/**< IO error 				 */
 
 /*@}*/
@@ -592,9 +592,9 @@ enum rt_device_class_type
 	RT_Device_Class_Graphic,                        /**< Graphic device                             */
 	RT_Device_Class_I2C,                            /**< I2C device                                 */
 	RT_Device_Class_USBDevice,                      /**< USB slave device                           */
-	RT_Device_Class_USBHost,                        /**< USB host bus                               */
-	RT_Device_Class_SPIBUS, 						/**< SPI bus device                             */
-	RT_Device_Class_SPIDevice,                      /**< SPI device                                 */
+	RT_Device_Class_USBHost,                        /**< USB host bus                               */
+	RT_Device_Class_SPIBUS, 						/**< SPI bus device                             */
+	RT_Device_Class_SPIDevice,                      /**< SPI device                                 */
 	RT_Device_Class_SDIO, 							/**< SDIO bus device                            */
 	RT_Device_Class_Unknown                         /**< unknown device                             */
 };
@@ -781,10 +781,12 @@ struct rt_module
 	rt_uint32_t stack_size;                         /**< priority of module's thread                */
 	rt_uint32_t thread_priority;
 
+#ifdef RT_USING_SLAB
 	/* module memory allocator */
 	void        *mem_list;                          /**< module's free memory list                  */
 	void        *page_array;                        /**< module's using pages                       */
 	rt_uint32_t page_cnt;                           /**< module's using pages count                 */
+#endif
 
 	rt_uint32_t nsym;                               /**< number of symbol in the module             */
 	struct rt_module_symtab *symtab;                /**< module symbol table                        */
diff --git a/src/module.c b/src/module.c
index 390497d69dbf7120f1bda9f06b11242f818bcc95..8853919135a3f0d1d1b0e0c0e551b9601f75a4f5 100644
--- a/src/module.c
+++ b/src/module.c
@@ -374,15 +374,15 @@ static struct rt_module* _load_shared_object(const char *name, void *module_ptr)
 	if (module_size == 0)
 	{
 		rt_kprintf(" module size error\n");
-
-		return module;
+		return RT_NULL;
 	}	
 
 	/* allocate module */
 	module = (struct rt_module *)rt_object_allocate(RT_Object_Class_Module, name);
-	if (!module)
-		return RT_NULL;
+	if (!module) return RT_NULL;
 
+	module->nref = 0;
+	
 	/* allocate module space */
 	module->module_space = rt_malloc(module_size);
 	if (module->module_space == RT_NULL)
@@ -774,10 +774,10 @@ rt_module_t rt_module_load(const char *name, void *module_ptr)
 
 	if (elf_module->e_entry != 0)
 	{	
+#ifdef RT_USING_SLAB
 		/* init module memory allocator */
 		module->mem_list = RT_NULL;
 
-#ifdef RT_USING_SLAB
 		/* create page array */
 		module->page_array = (void *)rt_malloc(PAGE_COUNT_MAX * sizeof(struct rt_page_info));
 		module->page_cnt = 0;
@@ -1527,7 +1527,6 @@ void *rt_module_realloc(void *ptr, rt_size_t size)
 		}
 	}
 }
-#endif
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
@@ -1569,3 +1568,5 @@ FINSH_FUNCTION_EXPORT(list_mempage, list module using memory page information)
 #endif
 
 #endif
+
+#endif