diff --git a/src/OT/glyf/path-builder.hh b/src/OT/glyf/path-builder.hh
index db9efa945..859cd577f 100644
--- a/src/OT/glyf/path-builder.hh
+++ b/src/OT/glyf/path-builder.hh
@@ -42,7 +42,7 @@ struct path_builder_t
   {
     bool is_on_curve = point.flag & glyf_impl::SimpleGlyph::FLAG_ON_CURVE;
 #ifdef HB_NO_CUBIC_GLYF
-    bool is_cubic = false;
+    constexpr bool is_cubic = false;
 #else
     bool is_cubic = !is_on_curve && (point.flag & glyf_impl::SimpleGlyph::FLAG_CUBIC);
 #endif