diff --git a/Structures.cs b/Structures.cs
index b44342c..0dcc1f3 100644
--- a/Structures.cs
+++ b/Structures.cs
@@ -112,8 +112,8 @@ namespace ReFuel.FreeType
         public uint GlyphIndex;
         public FTGeneric Generic;
         public FTGlyphMetrics Metrics;
-        public long LinearHorizontalAdvance;
-        public long LinearVerticalAdvance;
+        public int LinearHorizontalAdvance;
+        public int LinearVerticalAdvance;
         public FTVector Advance;
         public int Format;
         public FTBitmap Bitmap;