diff --git a/src/hb-ot-layout-gsubgpos-private.hh b/src/hb-ot-layout-gsubgpos-private.hh
index caa4d379ddf97745e59cebaa0f4fcd38ec08e8da..0023b31c199dbb38feef44c5e7a74d6e5d07e54f 100644
--- a/src/hb-ot-layout-gsubgpos-private.hh
+++ b/src/hb-ot-layout-gsubgpos-private.hh
@@ -2238,7 +2238,7 @@ struct ExtensionFormat1
   HBUINT16	extensionLookupType;	/* Lookup type of subtable referenced
 					 * by ExtensionOffset (i.e. the
 					 * extension subtable). */
-  HBUINT32		extensionOffset;	/* Offset to the extension subtable,
+  HBUINT32	extensionOffset;	/* Offset to the extension subtable,
 					 * of lookup type subtable. */
   public:
   DEFINE_SIZE_STATIC (8);