diff --git a/bouquin/statistics_dialog.py b/bouquin/statistics_dialog.py
index f6898e0..4950b6a 100644
--- a/bouquin/statistics_dialog.py
+++ b/bouquin/statistics_dialog.py
@@ -249,7 +249,6 @@ class StatisticsDialog(QDialog):
 
         self.setWindowTitle(strings._("statistics"))
         self.setMinimumWidth(600)
-        self.setMinimumHeight(350)
         root = QVBoxLayout(self)
 
         (
@@ -325,10 +324,16 @@ class StatisticsDialog(QDialog):
             self._revisions_by_date = revisions_by_date
 
             scroll = QScrollArea()
-            scroll.setWidgetResizable(True)
+            scroll.setWidgetResizable(False)
             scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
             scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
+            self._heatmap.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
             scroll.setWidget(self._heatmap)
+
+            # ensure the scroll area is never shorter than the heatmap's preferred height
+            scroll.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
+            scroll.setMinimumHeight(self._heatmap.minimumSizeHint().height())
+
             group_layout.addWidget(scroll)
 
             root.addWidget(group)
@@ -339,6 +344,8 @@ class StatisticsDialog(QDialog):
         else:
             root.addWidget(QLabel(strings._("stats_no_data")))
 
+        self.adjustSize()
+
     # ---------- internal helpers ----------
 
     def _apply_metric(self, metric: str) -> None: