diff --git a/src/View/Geometry/Translate.py b/src/View/Geometry/Translate.py
index e0b567ba..3a2528af 100644
--- a/src/View/Geometry/Translate.py
+++ b/src/View/Geometry/Translate.py
@@ -91,3 +91,9 @@ class GeometryTranslate(MainTranslate):
         self._dict["Shift"] = _translate(
             "Geometry", "Shift"
         )
+        self._dict["warning"] = _translate(
+            "Geometry", "Warning"
+        )
+        self._dict["format_not_exportable"] = _translate(
+            "Geometry", "The format of the file is not exportable."
+        )
diff --git a/src/View/Geometry/Window.py b/src/View/Geometry/Window.py
index 0f780035..89631518 100644
--- a/src/View/Geometry/Window.py
+++ b/src/View/Geometry/Window.py
@@ -691,7 +691,13 @@ class GeometryWindow(PamhyrWindow):
                 if suffix == ".st" or suffix == ".ST":
                     self._export_to_file_st(filename[:-3])
                 else:
-                    # TODO : prévenir l'utilisateur que le format n'est pas exportable
+                    # Warning popup when the format is not exportable
+                    win = QtWidgets.QMessageBox()
+                    win.setIcon(QtWidgets.QMessageBox.Warning)
+                    win.setWindowTitle(self._trad["warning"])
+                    win.setText(self._trad["format_not_exportable"])
+                    win.exec()
+                    
                     pass
             else:
                 self._export_to_file_st(filename)