diff --git a/src/hb-subset-cff-common.hh b/src/hb-subset-cff-common.hh
index bb9f27eec..7ec979c76 100644
--- a/src/hb-subset-cff-common.hh
+++ b/src/hb-subset-cff-common.hh
@@ -313,12 +313,12 @@ struct parsed_cs_op_t : op_str_t
   bool for_skip () const { return skip_flag; }
   void set_skip ()       { skip_flag = true; }
 
-  unsigned int  subr_num;
+  uint16_t subr_num;
 
   protected:
-  bool	  drop_flag;
-  bool	  keep_flag;
-  bool	  skip_flag;
+  bool	  drop_flag : 1;
+  bool	  keep_flag : 1;
+  bool	  skip_flag : 1;
 };
 
 struct parsed_cs_str_t : parsed_values_t<parsed_cs_op_t>