diff --git a/bsp/efm32/copy_this_file_shell.c b/bsp/efm32/copy_this_file_shell.c
index 24c2644e1e4..45ce3cb45a3 100644
--- a/bsp/efm32/copy_this_file_shell.c
+++ b/bsp/efm32/copy_this_file_shell.c
@@ -88,7 +88,7 @@ int isprint(unsigned char ch)
 
 #if defined(RT_USING_DFS) && defined(DFS_USING_WORKDIR)
 #include <dfs_posix.h>
-const char* finsh_get_prompt()
+const char* finsh_get_prompt(void)
 {
 	#define _PROMPT "finsh "
 	static char finsh_prompt[RT_CONSOLEBUF_SIZE + 1] = {_PROMPT};
diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index 852d3e7ac77..61f0b9562e6 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -101,7 +101,7 @@ int finsh_set_prompt(const char * prompt)
 #include <dfs_posix.h>
 #endif /* RT_USING_DFS */
 
-const char *finsh_get_prompt()
+const char *finsh_get_prompt(void)
 {
 #define _MSH_PROMPT "msh "
 #define _PROMPT     "finsh "