diff --git a/src/woff2_enc.cc b/src/woff2_enc.cc
index ec00878..0b95273 100644
--- a/src/woff2_enc.cc
+++ b/src/woff2_enc.cc
@@ -200,6 +200,13 @@ bool TransformFontCollection(FontCollection* font_collection) {
     if (!TransformGlyfAndLocaTables(&font)) {
 #ifdef FONT_COMPRESSION_BIN
       fprintf(stderr, "glyf/loca transformation failed.\n");
+#endif
+      return FONT_COMPRESSION_FAILURE();
+    }
+
+    if (!TransformHmtxTable(&font)) {
+#ifdef FONT_COMPRESSION_BIN
+      fprintf(stderr, "hmtx transformation failed.\n");
 #endif
       return FONT_COMPRESSION_FAILURE();
     }