diff --git a/src/hb-ot-layout-common.hh b/src/hb-ot-layout-common.hh
index 9f53e9d27..f2a58028e 100644
--- a/src/hb-ot-layout-common.hh
+++ b/src/hb-ot-layout-common.hh
@@ -37,7 +37,7 @@
 
 
 #ifndef HB_MAX_NESTING_LEVEL
-#define HB_MAX_NESTING_LEVEL	6
+#define HB_MAX_NESTING_LEVEL	64
 #endif
 #ifndef HB_MAX_CONTEXT_LENGTH
 #define HB_MAX_CONTEXT_LENGTH	64