diff --git a/pkg/netsurf/libhubbub/gen.lua b/pkg/netsurf/libhubbub/gen.lua
index fb143270..ee392ade 100644
--- a/pkg/netsurf/libhubbub/gen.lua
+++ b/pkg/netsurf/libhubbub/gen.lua
@@ -1,4 +1,5 @@
 cflags{
+	'-D NDEBUG',
 	'-I $outdir',
 	'-I $srcdir/src',
 	'-I $srcdir/include',