diff --git a/docs/examples/hsts-preload.c b/docs/examples/hsts-preload.c
index a25773f42d..ba9fe87a94 100644
--- a/docs/examples/hsts-preload.c
+++ b/docs/examples/hsts-preload.c
@@ -87,7 +87,7 @@ int main(void)
     struct state st = {0};
 
     /* enable HSTS for this handle */
-    curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, (long)CURLHSTS_ENABLE);
+    curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, CURLHSTS_ENABLE);
 
     /* function to call at first to populate the cache before the transfer */
     curl_easy_setopt(curl, CURLOPT_HSTSREADFUNCTION, hstsread);
diff --git a/docs/libcurl/opts/CURLOPT_HSTS_CTRL.md b/docs/libcurl/opts/CURLOPT_HSTS_CTRL.md
index 8305a62a39..0dce5fb93f 100644
--- a/docs/libcurl/opts/CURLOPT_HSTS_CTRL.md
+++ b/docs/libcurl/opts/CURLOPT_HSTS_CTRL.md
@@ -23,8 +23,8 @@ CURLOPT_HSTS_CTRL - control HSTS behavior
 ~~~c
 #include <curl/curl.h>
 
-#define CURLHSTS_ENABLE       (1<<0)
-#define CURLHSTS_READONLYFILE (1<<1)
+#define CURLHSTS_ENABLE       (long)(1<<0)
+#define CURLHSTS_READONLYFILE (long)(1<<1)
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTS_CTRL, long bitmask);
 ~~~
@@ -64,7 +64,7 @@ int main(void)
 {
   CURL *curl = curl_easy_init();
   if(curl) {
-    curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, (long)CURLHSTS_ENABLE);
+    curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, CURLHSTS_ENABLE);
     curl_easy_perform(curl);
   }
 }