diff --git a/src/helper/command.c b/src/helper/command.c
index 7ce7c2245d94768065f4d63470a5f932ef34cdc5..035b7dbc761cf6da865a7f8fb118b8fe041e8655 100644
--- a/src/helper/command.c
+++ b/src/helper/command.c
@@ -709,7 +709,7 @@ int handle_fast_command(struct command_context_s *cmd_ctx, char *cmd, char **arg
 	return ERROR_OK;
 }
 
-void process_jim_events() 
+void process_jim_events(void) 
 {
 #ifdef JIM_EMBEDDED
 	static int recursion = 0;
diff --git a/src/helper/command.h b/src/helper/command.h
index b410edb7d6af694c1f3385e25daea272d7eb291e..23125bedc46d58a58e0d851fb7dd4a674b53949b 100644
--- a/src/helper/command.h
+++ b/src/helper/command.h
@@ -79,7 +79,7 @@ extern int command_run_line(command_context_t *context, char *line);
 extern int command_run_linef(command_context_t *context, char *format, ...);
 extern void command_output_text(command_context_t *context, const char *data);
 
-extern void process_jim_events();
+extern void process_jim_events(void);
 
 #define		ERROR_COMMAND_CLOSE_CONNECTION		(-600)
 #define		ERROR_COMMAND_SYNTAX_ERROR			(-601)