diff --git a/onionshare_gui/gui_common.py b/onionshare_gui/gui_common.py
index 4b8fe5d4..7eb4f0e8 100644
--- a/onionshare_gui/gui_common.py
+++ b/onionshare_gui/gui_common.py
@@ -18,6 +18,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 import os
+import json
 
 from onionshare import strings
 from onionshare.onion import Onion
@@ -37,6 +38,18 @@ class GuiCommon:
         self.qtapp = qtapp
         self.local_only = local_only
 
+        # Are we running in a flatpak package?
+        self.is_flatpak = False
+        if os.path.exists("/app/manifest.json"):
+            try:
+                with open("/app/manifest.json") as f:
+                    manifest_data = json.loads(f.read())
+                    if manifest_data["id"] == "org.onionshare.OnionShare":
+                        self.is_flatpak = True
+                        self.common.log("GuiCommon", "__init__", "is_flatpak=True")
+            except:
+                pass
+
         # Load settings
         self.common.load_settings()