diff --git a/include/dap_common.h b/include/dap_common.h
index d84e945c9844b9f7cae7ad61b927873b16cd8d39..b88fdcada06b8e424f5f453f298e9dce8abb2437 100755
--- a/include/dap_common.h
+++ b/include/dap_common.h
@@ -329,8 +329,8 @@ DAP_STATIC_INLINE void DAP_AtomicUnlock( dap_spinlock_t *lock )
 
 
 
-char *g_sys_dir_path ;
-size_t g_sys_dir_path_len;
+extern char *g_sys_dir_path ;
+extern size_t g_sys_dir_path_len;
 
 
 //int dap_common_init( const char * a_log_file );