diff --git a/cmdgen.c b/cmdgen.c
index dbac992c..c3720b57 100644
--- a/cmdgen.c
+++ b/cmdgen.c
@@ -906,7 +906,7 @@ int main(int argc, char **argv)
      * we have just generated a key.
      */
     if (!new_passphrase && (change_passphrase || keytype != NOKEYGEN)) {
-        prompts_t *p = new_prompts(NULL);
+        prompts_t *p = new_prompts();
         int ret;
 
         p->to_server = false;
diff --git a/putty.h b/putty.h
index 0c4816cb..52cd90df 100644
--- a/putty.h
+++ b/putty.h
@@ -667,7 +667,7 @@ typedef struct {
     void *data;         /* slot for housekeeping data, managed by
                          * seat_get_userpass_input(); initially NULL */
 } prompts_t;
-prompts_t *new_prompts();
+prompts_t *new_prompts(void);
 void add_prompt(prompts_t *p, char *promptstr, bool echo);
 void prompt_set_result(prompt_t *pr, const char *newstr);
 char *prompt_get_result(prompt_t *pr);
diff --git a/ssh1login.c b/ssh1login.c
index c02b8d02..145ac640 100644
--- a/ssh1login.c
+++ b/ssh1login.c
@@ -648,7 +648,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
                         ppl_printf("No passphrase required.\r\n");
                     passphrase = NULL;
                 } else {
-                    s->cur_prompt = new_prompts(s->ppl.seat);
+                    s->cur_prompt = new_prompts();
                     s->cur_prompt->to_server = false;
                     s->cur_prompt->from_server = false;
                     s->cur_prompt->name = dupstr("SSH key passphrase");
@@ -786,7 +786,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
         /*
          * Otherwise, try various forms of password-like authentication.
          */
-        s->cur_prompt = new_prompts(s->ppl.seat);
+        s->cur_prompt = new_prompts();
 
         if (conf_get_bool(s->conf, CONF_try_tis_auth) &&
             (s->supported_auths_mask & (1 << SSH1_AUTH_TIS)) &&