diff --git a/lib/cookie.c b/lib/cookie.c
index c6c4a7bdd9..f56bd85a93 100644
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -1617,7 +1617,7 @@ struct curl_slist *Curl_cookie_list(struct Curl_easy *data)
   return list;
 }
 
-void Curl_flush_cookies(struct Curl_easy *data, int cleanup)
+void Curl_flush_cookies(struct Curl_easy *data, bool cleanup)
 {
   if(data->set.str[STRING_COOKIEJAR]) {
     if(data->change.cookielist) {
diff --git a/lib/cookie.h b/lib/cookie.h
index b2730cfb91..b3865e601a 100644
--- a/lib/cookie.h
+++ b/lib/cookie.h
@@ -109,7 +109,7 @@ void Curl_cookie_clearsess(struct CookieInfo *cookies);
 #define Curl_cookie_cleanup(x) Curl_nop_stmt
 #define Curl_flush_cookies(x,y) Curl_nop_stmt
 #else
-void Curl_flush_cookies(struct Curl_easy *data, int cleanup);
+void Curl_flush_cookies(struct Curl_easy *data, bool cleanup);
 void Curl_cookie_cleanup(struct CookieInfo *);
 struct CookieInfo *Curl_cookie_init(struct Curl_easy *data,
                                     const char *, struct CookieInfo *, bool);
diff --git a/lib/setopt.c b/lib/setopt.c
index f2006cbf49..64c29e3336 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -752,7 +752,7 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
     }
     else if(strcasecompare(argptr, "FLUSH")) {
       /* flush cookies to file, takes care of the locking */
-      Curl_flush_cookies(data, 0);
+      Curl_flush_cookies(data, FALSE);
     }
     else if(strcasecompare(argptr, "RELOAD")) {
       /* reload cookies from file */
diff --git a/lib/url.c b/lib/url.c
index 8538d24dd7..fdbee90e6d 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -374,7 +374,7 @@ CURLcode Curl_close(struct Curl_easy *data)
   Curl_safefree(data->state.buffer);
   Curl_safefree(data->state.headerbuff);
   Curl_safefree(data->state.ulbuf);
-  Curl_flush_cookies(data, 1);
+  Curl_flush_cookies(data, TRUE);
 #ifdef USE_ALTSVC
   Curl_altsvc_save(data->asi, data->set.str[STRING_ALTSVC]);
   Curl_altsvc_cleanup(data->asi);