diff --git a/src/osx/carbon/font.cpp b/src/osx/carbon/font.cpp
index 309d57d417..e096778dfb 100644
--- a/src/osx/carbon/font.cpp
+++ b/src/osx/carbon/font.cpp
@@ -183,7 +183,7 @@ namespace
 
     int CTWeightToWX(CGFloat weight)
     {
-        for (int i = 0; i < kCTWeightsCount; ++i)
+        for (int i = 0; i < kCTWeightsCount - 1; ++i)
         {
             if ( (weight - gCTWeights[i]) < (gCTWeights[i+1]-weight) )
                 return i * 100;