diff --git a/Riot/Modules/Application/AppDelegate.swift b/Riot/Modules/Application/AppDelegate.swift
index c92e2e21c..e112fa7e0 100644
--- a/Riot/Modules/Application/AppDelegate.swift
+++ b/Riot/Modules/Application/AppDelegate.swift
@@ -61,7 +61,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         
         // Register pills provider.
         if #available(iOS 15.0, *) {
-            NSTextAttachment.registerViewProviderClass(PillAttachmentViewProvider.self, forFileType: "im.vector.app.pills")
+            NSTextAttachment.registerViewProviderClass(PillAttachmentViewProvider.self, forFileType: StringPillsUtils.pillUTType)
         }
         
         // Create AppCoordinator
diff --git a/Riot/Modules/Pills/PillAttachmentView.swift b/Riot/Modules/Pills/PillAttachmentView.swift
index 4ed0b2d4f..4f2061e4d 100644
--- a/Riot/Modules/Pills/PillAttachmentView.swift
+++ b/Riot/Modules/Pills/PillAttachmentView.swift
@@ -17,6 +17,8 @@
 import UIKit
 
 /// Base view class for mention Pills.
+@available (iOS 15.0, *)
+@objcMembers
 class PillAttachmentView: UIView {
     /// Computes size required to display a pill for given room member.
     ///
diff --git a/Riot/Modules/Pills/PillTextAttachment.swift b/Riot/Modules/Pills/PillTextAttachment.swift
index 5b939627c..3469cb17f 100644
--- a/Riot/Modules/Pills/PillTextAttachment.swift
+++ b/Riot/Modules/Pills/PillTextAttachment.swift
@@ -18,7 +18,9 @@ import UIKit
 import MatrixSDK
 
 /// Text attachment for pills display.
-@objcMembers class PillTextAttachment: NSTextAttachment {
+@available (iOS 15.0, *)
+@objcMembers
+class PillTextAttachment: NSTextAttachment {
     // MARK: - Internal Properties
     var roomMember: MXRoomMember?
     var isCurrentUser: Bool = false
@@ -38,7 +40,7 @@ import MatrixSDK
     }
 
     init(withRoomMember roomMember: MXRoomMember, isCurrentUser: Bool) {
-        super.init(data: nil, ofType: "im.vector.app.pills")
+        super.init(data: nil, ofType: StringPillsUtils.pillUTType)
         self.roomMember = roomMember
         self.isCurrentUser = isCurrentUser
         let pillSize = PillAttachmentView.size(forRoomMember: roomMember)
@@ -52,7 +54,7 @@ import MatrixSDK
         }
 
         super.init(coder: coder)
-        self.fileType = "im.vector.app.pills"
+        self.fileType = StringPillsUtils.pillUTType
 
         self.roomMember = roomMember
         self.isCurrentUser = coder.decodeBool(forKey: Constants.isCurrentUserKey)
diff --git a/Riot/Modules/Pills/StringPillsUtils.swift b/Riot/Modules/Pills/StringPillsUtils.swift
index 8665db3b8..6240f03f5 100644
--- a/Riot/Modules/Pills/StringPillsUtils.swift
+++ b/Riot/Modules/Pills/StringPillsUtils.swift
@@ -21,6 +21,10 @@ import UIKit
 @available (iOS 15.0, *)
 @objcMembers
 class StringPillsUtils: NSObject {
+    // MARK: - Internal Properties
+    /// UTType identifier for pills. Should be declared as Document type & Exported type identifier inside Info.plist
+    static let pillUTType: String = "im.vector.app.pills"
+
     // MARK: - Internal Methods
     /// Insert text attachments for pills inside given message attributed string.
     ///
diff --git a/Riot/Modules/Room/CellData/RoomBubbleCellData.m b/Riot/Modules/Room/CellData/RoomBubbleCellData.m
index 2792de1c2..d367d244d 100644
--- a/Riot/Modules/Room/CellData/RoomBubbleCellData.m
+++ b/Riot/Modules/Room/CellData/RoomBubbleCellData.m
@@ -433,9 +433,11 @@ NSString *const URLPreviewDidUpdateNotification = @"URLPreviewDidUpdateNotificat
             {
                 // Apply alpha to blur this component
                 componentString = [Tools setTextColorAlpha:.2 inAttributedString:componentString];
-                [Tools setPillAlpha:.2 inAttributedString:componentString];
+                if (@available(iOS 15.0, *)) {
+                    [Tools setPillAlpha:.2 inAttributedString:componentString];
+                }
             }
-            else
+            else if (@available(iOS 15.0, *))
             {
                 // PillTextAttachment are not created again every time, we have to set alpha back to standard if needed.
                 [Tools setPillAlpha:1.f inAttributedString:componentString];
@@ -478,9 +480,11 @@ NSString *const URLPreviewDidUpdateNotification = @"URLPreviewDidUpdateNotificat
             {
                 // Apply alpha to blur this component
                 componentString = [Tools setTextColorAlpha:.2 inAttributedString:componentString];
-                [Tools setPillAlpha:.2 inAttributedString:componentString];
+                if (@available(iOS 15.0, *)) {
+                    [Tools setPillAlpha:.2 inAttributedString:componentString];
+                }
             }
-            else
+            else if (@available(iOS 15.0, *))
             {
                 // PillTextAttachment are not created again every time, we have to set alpha back to standard if needed.
                 [Tools setPillAlpha:1.f inAttributedString:componentString];
diff --git a/Riot/Utils/Tools.swift b/Riot/Utils/Tools.swift
index 1dc840222..e2f1954a0 100644
--- a/Riot/Utils/Tools.swift
+++ b/Riot/Utils/Tools.swift
@@ -41,6 +41,7 @@ extension Tools {
     /// - Parameters:
     ///   - alpha: Alpha value to apply
     ///   - attributedString: Attributed string containing the pills
+    @available (iOS 15.0, *)
     @objc static func setPillAlpha(_ alpha: CGFloat, inAttributedString attributedString: NSAttributedString) {
         let totalRange = NSRange(location: 0, length: attributedString.length)
         attributedString.vc_enumerateAttribute(.attachment,