diff --git a/qt/base/details_dialog.py b/qt/base/details_dialog.py
index 0f15ddd8..d9c52a2e 100644
--- a/qt/base/details_dialog.py
+++ b/qt/base/details_dialog.py
@@ -17,8 +17,10 @@ class DetailsDialog(QDialog):
         self.app = app
         self.model = app.model.details_panel
         self._setupUi()
-        if self.app.prefs.detailsWindowRect is not None:
-            self.setGeometry(self.app.prefs.detailsWindowRect)
+        # To avoid saving uninitialized geometry on appWillSavePrefs, we track whether our dialog
+        # has been shown. If it has, we know that our geometry should be saved.
+        self._shown_once = False
+        self.app.prefs.restoreGeometry('DetailsWindowRect', self)
         self.tableModel = DetailsModel(self.model)
         # tableView is defined in subclasses
         self.tableView.setModel(self.tableModel)
@@ -29,9 +31,14 @@ class DetailsDialog(QDialog):
     def _setupUi(self): # Virtual
         pass
     
+    def show(self):
+        self._shown_once = True
+        QDialog.show(self)
+
     #--- Events
     def appWillSavePrefs(self):
-        self.app.prefs.detailsWindowRect = self.geometry()
+        if self._shown_once:
+            self.app.prefs.saveGeometry('DetailsWindowRect', self)
     
     #--- model --> view
     def refresh(self):
diff --git a/qt/base/preferences.py b/qt/base/preferences.py
index 0154d8eb..e92a511b 100644
--- a/qt/base/preferences.py
+++ b/qt/base/preferences.py
@@ -33,7 +33,6 @@ class Preferences(PreferencesBase):
         self.tableFontSize = get('TableFontSize', self.tableFontSize)
         self.resultWindowIsMaximized = get('ResultWindowIsMaximized', self.resultWindowIsMaximized)
         self.resultWindowRect = self.get_rect('ResultWindowRect', self.resultWindowRect)
-        self.detailsWindowRect = self.get_rect('DetailsWindowRect', self.detailsWindowRect)
         self.directoriesWindowRect = self.get_rect('DirectoriesWindowRect', self.directoriesWindowRect)
         self.recentResults = get('RecentResults', self.recentResults)
         self.recentFolders = get('RecentFolders', self.recentFolders)
@@ -58,7 +57,6 @@ class Preferences(PreferencesBase):
         self.tableFontSize = QApplication.font().pointSize()
         self.resultWindowIsMaximized = False
         self.resultWindowRect = None
-        self.detailsWindowRect = None
         self.directoriesWindowRect = None
         self.recentResults = []
         self.recentFolders = []
@@ -84,7 +82,6 @@ class Preferences(PreferencesBase):
         set_('TableFontSize', self.tableFontSize)
         set_('ResultWindowIsMaximized', self.resultWindowIsMaximized)
         self.set_rect('ResultWindowRect', self.resultWindowRect)
-        self.set_rect('DetailsWindowRect', self.detailsWindowRect)
         self.set_rect('DirectoriesWindowRect', self.directoriesWindowRect)
         set_('RecentResults', self.recentResults)
         set_('RecentFolders', self.recentFolders)