diff --git a/src/addon/mod/forum/pages/discussion/discussion.ts b/src/addon/mod/forum/pages/discussion/discussion.ts
index 0f076b58b..50bff42b8 100644
--- a/src/addon/mod/forum/pages/discussion/discussion.ts
+++ b/src/addon/mod/forum/pages/discussion/discussion.ts
@@ -351,12 +351,16 @@ export class AddonModForumDiscussionPage implements OnDestroy {
                 this.ratingInfo = ratingInfo;
             });
         }).then(() => {
-            // Use the canAddDiscussion WS to check if the user can pin discussions.
-            return this.forumProvider.canAddDiscussionToAll(this.forumId).then((response) => {
-                this.canPin = !!response.canpindiscussions;
-            }).catch(() => {
+            if (this.forumProvider.isSetPinStateAvailableForSite()) {
+                // Use the canAddDiscussion WS to check if the user can pin discussions.
+                return this.forumProvider.canAddDiscussionToAll(this.forumId).then((response) => {
+                    this.canPin = !!response.canpindiscussions;
+                }).catch(() => {
+                    this.canPin = false;
+                });
+            } else {
                 this.canPin = false;
-            });
+            }
         }).then(() => {
             return this.ratingOffline.hasRatings('mod_forum', 'post', 'module', this.cmId, this.discussionId).then((hasRatings) => {
                 this.hasOfflineRatings = hasRatings;
diff --git a/src/addon/mod/forum/providers/forum.ts b/src/addon/mod/forum/providers/forum.ts
index 91f1d2dad..6bd80e7bd 100644
--- a/src/addon/mod/forum/providers/forum.ts
+++ b/src/addon/mod/forum/providers/forum.ts
@@ -14,6 +14,7 @@
 
 import { Injectable } from '@angular/core';
 import { TranslateService } from '@ngx-translate/core';
+import { CoreSite } from '@classes/site';
 import { CoreAppProvider } from '@providers/app';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreGroupsProvider } from '@providers/groups';
@@ -784,6 +785,19 @@ export class AddonModForumProvider {
         });
     }
 
+    /**
+     * Returns whether the set pin state WS is available.
+     *
+     * @param  {CoreSite} [site] Site. If not defined, current site.
+     * @return {boolean} Whether it's available.
+     * @since 3.7
+     */
+    isSetPinStateAvailableForSite(site?: CoreSite): boolean {
+        site = site || this.sitesProvider.getCurrentSite();
+
+        return this.sitesProvider.wsAvailableInCurrentSite('mod_forum_set_pin_state');
+    }
+
     /**
      * Pin or unpin a discussion.
      *