diff --git a/modules/juce_graphics/native/juce_mac_Fonts.mm b/modules/juce_graphics/native/juce_mac_Fonts.mm
index 83ba29472a..7303c5b632 100644
--- a/modules/juce_graphics/native/juce_mac_Fonts.mm
+++ b/modules/juce_graphics/native/juce_mac_Fonts.mm
@@ -274,7 +274,8 @@ namespace CoreTextTypeLayout
             if (attribStringLen <= wordBegin)
                 continue;
 
-            const auto wordEnd = jmin (attribStringLen, (currentPosition + attr.range.getLength()).getAddress() - beginPtr.getAddress());
+            const auto wordEndAddress = (currentPosition + attr.range.getLength()).getAddress();
+            const auto wordEnd = jmin (attribStringLen, (CFIndex) (wordEndAddress - beginPtr.getAddress()));
             const auto range = CFRangeMake (wordBegin, wordEnd - wordBegin);
 
             if (auto ctFontRef = getOrCreateFont (attr.font))