diff --git a/Classes/GDIIndexBar.m b/Classes/GDIIndexBar.m
index 061fae9..45135d6 100644
--- a/Classes/GDIIndexBar.m
+++ b/Classes/GDIIndexBar.m
@@ -349,7 +349,7 @@ - (NSUInteger)numberOfDisplayableRows
 {
     CGFloat rowHeight = _lineHeight + _textSpacing;
     CGFloat desiredHeight = _textSpacing * 2 + rowHeight * _numberOfIndexes;
-    if (desiredHeight > self.bounds.size.height) {
+    if (desiredHeight > self.bounds.size.height && self.bounds.size.height >= rowHeight) {
         NSUInteger numberOfRowsThatFit = self.bounds.size.height / rowHeight;
         numberOfRowsThatFit -= (numberOfRowsThatFit%2==0) ? 1 : 0;
         return numberOfRowsThatFit;