diff --git a/core/my_basic.c b/core/my_basic.c
index ddd879c..1c78f49 100755
--- a/core/my_basic.c
+++ b/core/my_basic.c
@@ -15914,7 +15914,7 @@ static int _std_input(mb_interpreter_t* s, void** l) {
 			obj->data.variable->data->data.string = _HEAP_CHAR_BUF(buf);
 		} while(0);
 #else /* MB_CP_VC && MB_ENABLE_UNICODE */
-		obj->data.variable->data->data.string = mb_memdup(line, len + 1);
+		obj->data.variable->data->data.string = mb_memdup(line, (unsigned)(len + 1));
 #endif /* MB_CP_VC && MB_ENABLE_UNICODE */
 		ast = ast->next;
 	} else {
diff --git a/output/my_basic_mac b/output/my_basic_mac
index 812a329..620bc92 100755
Binary files a/output/my_basic_mac and b/output/my_basic_mac differ
diff --git a/shell/main.c b/shell/main.c
index 8fe1e62..925b3ac 100755
--- a/shell/main.c
+++ b/shell/main.c
@@ -214,7 +214,7 @@ static void _tidy_mem_pool(bool_t force) {
 		return;
 
 	for(i = 0; i < pool_count; i++) {
-		while(s = pool[i].stack) {
+		while((s = pool[i].stack)) {
 			pool[i].stack = (char*)_POOL_NODE_NEXT(s);
 			_POOL_NODE_FREE(s);
 		}
@@ -293,7 +293,7 @@ static void _close_mem_pool(void) {
 		return;
 
 	for(i = 0; i < pool_count; i++) {
-		while(s = pool[i].stack) {
+		while((s = pool[i].stack)) {
 			pool[i].stack = (char*)_POOL_NODE_NEXT(s);
 			_POOL_NODE_FREE(s);
 		}