diff --git a/src/hb-open-file.hh b/src/hb-open-file.hh
index d3b748602..b17320579 100644
--- a/src/hb-open-file.hh
+++ b/src/hb-open-file.hh
@@ -485,7 +485,7 @@ struct OpenTypeFontFile
 {
   enum {
     CFFTag		= HB_TAG ('O','T','T','O'), /* OpenType with Postscript outlines */
-    TrueTypeTag	= HB_TAG ( 0 , 1 , 0 , 0 ), /* OpenType with TrueType outlines */
+    TrueTypeTag		= HB_TAG ( 0 , 1 , 0 , 0 ), /* OpenType with TrueType outlines */
     TTCTag		= HB_TAG ('t','t','c','f'), /* TrueType Collection */
     DFontTag		= HB_TAG ( 0 , 0 , 1 , 0 ), /* DFont Mac Resource Fork */
     TrueTag		= HB_TAG ('t','r','u','e'), /* Obsolete Apple TrueType */