diff --git a/src/hb-cff2-interp-cs.hh b/src/hb-cff2-interp-cs.hh
index 592a1b23e..03dea4934 100644
--- a/src/hb-cff2-interp-cs.hh
+++ b/src/hb-cff2-interp-cs.hh
@@ -243,6 +243,7 @@ struct CFF2CSOpSet : CSOpSet<BlendArg, OPSET, CFF2CSInterpEnv, PARAM, PATH>
   static inline void process_vsindex (CFF2CSInterpEnv &env, PARAM& param)
   {
     env.process_vsindex ();
+    env.clear_args ();
   }
 
   private:
diff --git a/src/hb-ot-cff2-table.hh b/src/hb-ot-cff2-table.hh
index 04d9e2b38..1b01c1cfe 100644
--- a/src/hb-ot-cff2-table.hh
+++ b/src/hb-ot-cff2-table.hh
@@ -347,6 +347,7 @@ struct CFF2PrivateDictOpSet : DictOpSet
       case OpCode_vsindexdict:
         env.process_vsindex ();
         dictval.ivs = env.get_ivs ();
+        env.clear_args ();
         break;
       case OpCode_blenddict:
         break;