diff --git a/libdino/src/application.vala b/libdino/src/application.vala
index 048a88ff..1c0368f8 100644
--- a/libdino/src/application.vala
+++ b/libdino/src/application.vala
@@ -15,6 +15,8 @@ public interface Application : GLib.Application {
     public abstract StreamInteractor stream_interactor { get; set; }
     public abstract Plugins.Registry plugin_registry { get; set; }
     public abstract SearchPathGenerator? search_path_generator { get; set; }
+    public abstract uint inhibit_app(string reason);
+    public abstract void uninhibit_app(uint cookie);
 
     internal static string print_xmpp;
 
diff --git a/libdino/src/service/file_manager.vala b/libdino/src/service/file_manager.vala
index f5096df7..090c9595 100644
--- a/libdino/src/service/file_manager.vala
+++ b/libdino/src/service/file_manager.vala
@@ -250,6 +250,9 @@ public class FileManager : StreamInteractionModule, Object {
 
             OutputStream os = file.create(FileCreateFlags.REPLACE_DESTINATION);
             file_transfer.cancellable.reset();
+
+            uint inhibit_cookie = Application.get_default()
+                .inhibit_app("Ongoing file download");
             uint8[] buffer = new uint8[1024];
             ssize_t read;
             while ((read = yield input_stream.read_async(buffer, Priority.LOW, file_transfer.cancellable)) > 0) {
@@ -259,6 +262,7 @@ public class FileManager : StreamInteractionModule, Object {
                 buffer.length = 1024;
             }
             yield input_stream.close_async(Priority.LOW, file_transfer.cancellable);
+            Application.get_default().uninhibit_app(inhibit_cookie);
             yield os.close_async(Priority.LOW, file_transfer.cancellable);
             file_transfer.path = file.get_basename();
             file_transfer.input_stream = yield file.read_async();
diff --git a/main/src/ui/application.vala b/main/src/ui/application.vala
index a7aaf075..0b92bf19 100644
--- a/main/src/ui/application.vala
+++ b/main/src/ui/application.vala
@@ -342,5 +342,20 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
         });
         dialog.present();
     }
-}
 
+    private uint inhibit_app(string reason) {
+        uint inhibit_cookie = inhibit(window, SUSPEND, reason);
+
+        if (inhibit_cookie == 0) {
+            warning("suspend inhibit request failed or unsupported");
+        }
+
+        return inhibit_cookie;
+    }
+
+    private void uninhibit_app(uint inhibit_cookie) {
+        if (inhibit_cookie != 0) {
+            uninhibit(inhibit_cookie);
+        }
+    }
+}
diff --git a/plugins/http-files/src/file_sender.vala b/plugins/http-files/src/file_sender.vala
index 0dfa5b1b..9c2e8327 100644
--- a/plugins/http-files/src/file_sender.vala
+++ b/plugins/http-files/src/file_sender.vala
@@ -125,16 +125,23 @@ public class HttpFileSender : FileSender, Object {
         foreach (var entry in file_send_data.headers.entries) {
             put_message.request_headers.append(entry.key, entry.value);
         }
+
+        uint inhibit_cookie = 0;
         try {
+            inhibit_cookie = Application.get_default()
+                .inhibit_app("Ongoing file upload");
 #if SOUP_3_0
             yield session.send_async(put_message, GLib.Priority.LOW, file_transfer.cancellable);
 #else
             yield session.send_async(put_message, file_transfer.cancellable);
 #endif
+            Application.get_default().uninhibit_app(inhibit_cookie);
+
             if (put_message.status_code < 200 || put_message.status_code >= 300) {
                 throw new FileSendError.UPLOAD_FAILED("HTTP status code %s".printf(put_message.status_code.to_string()));
             }
         } catch (Error e) {
+            Application.get_default().uninhibit_app(inhibit_cookie);
             throw new FileSendError.UPLOAD_FAILED("HTTP upload error: %s".printf(e.message));
         }
     }