diff --git a/sleepyhead/Graphs/gSegmentChart.cpp b/sleepyhead/Graphs/gSegmentChart.cpp
index ee486bd5..a7b63ff8 100644
--- a/sleepyhead/Graphs/gSegmentChart.cpp
+++ b/sleepyhead/Graphs/gSegmentChart.cpp
@@ -41,7 +41,7 @@ void gSegmentChart::SetDay(Day *d)
 
         for (QList<Session *>::iterator s = m_day->begin(); s != m_day->end(); ++s) {
             if ((*s)->enabled() && (*s)->m_cnt.contains(m_codes[c])) {
-                int cnt = (*s)->count(m_codes[c]);
+                EventDataType cnt = (*s)->count(m_codes[c]);
                 m_values[c] += cnt;
                 m_total += cnt;
             }
@@ -100,7 +100,7 @@ void gSegmentChart::paint(QPainter &painter, gGraph &w, const QRegion &region)
         return;
     }
 
-    int data;
+    EventDataType data;
     unsigned size = m_values.size();
     float line_step = float(width) / float(size - 1);
     bool line_first = true;
diff --git a/sleepyhead/Graphs/gSegmentChart.h b/sleepyhead/Graphs/gSegmentChart.h
index ac390b5a..1a69434f 100644
--- a/sleepyhead/Graphs/gSegmentChart.h
+++ b/sleepyhead/Graphs/gSegmentChart.h
@@ -49,10 +49,10 @@ class gSegmentChart : public Layer
   protected:
     QVector<ChannelID> m_codes;
     QVector<QString> m_names;
-    QVector<int> m_values;
+    QVector<EventDataType> m_values;
     QVector<QColor> m_colors;
 
-    int m_total;
+    EventDataType m_total;
     GraphSegmentType m_graph_type;
     QColor m_gradient_color;
     QColor m_outline_color;