diff --git a/windows/winjump.c b/windows/winjump.c
index 745984ca..d33b5ce0 100644
--- a/windows/winjump.c
+++ b/windows/winjump.c
@@ -715,7 +715,7 @@ void remove_session_from_jumplist(const char * const sessionname)
 /* Set Explicit App User Model Id to fix removable media error with
    jump lists */
 
-bool set_explicit_app_user_model_id()
+bool set_explicit_app_user_model_id(void)
 {
   DECL_WINDOWS_FUNCTION(static, HRESULT, SetCurrentProcessExplicitAppUserModelID,
                         (PCWSTR));
diff --git a/windows/winstuff.h b/windows/winstuff.h
index bbba4c3b..c5d0ba24 100644
--- a/windows/winstuff.h
+++ b/windows/winstuff.h
@@ -621,7 +621,7 @@ extern const struct BackendVtable serial_backend;
 void add_session_to_jumplist(const char * const sessionname);
 void remove_session_from_jumplist(const char * const sessionname);
 void clear_jumplist(void);
-bool set_explicit_app_user_model_id();
+bool set_explicit_app_user_model_id(void);
 
 /*
  * Exports from winnoise.c.