diff --git a/src/barchart/qbarseries.cpp b/src/barchart/qbarseries.cpp
index b13dd95..59544a4 100644
--- a/src/barchart/qbarseries.cpp
+++ b/src/barchart/qbarseries.cpp
@@ -382,7 +382,7 @@ QBarSet* QBarSeriesPrivate::barsetAt(int index)
 
 QString QBarSeriesPrivate::categoryName(int category)
 {
-    if ((category > 0) && (category < m_categories.count())) {
+    if ((category >= 0) && (category < m_categories.count())) {
         return m_categories.at(category);
     }