diff --git a/src/vm.c b/src/vm.c
index 586585079..2cb5b1150 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -28,16 +28,10 @@ extern "C" {
 #endif
 void abort(void);
 #if defined(__cplusplus)
-}  /* extern "C" { */
+}  /* extern "C" */
 #endif
 #endif
 
-#if defined(MRB_USE_CXX_EXCEPTION) && defined(__cplusplus)
-# if !defined(MRB_USE_CXX_ABI)
-extern "C" {
-# endif
-#endif
-
 #define STACK_INIT_SIZE 128
 #define CALLINFO_INIT_SIZE 32
 
@@ -3124,8 +3118,5 @@ mrb_top_run(mrb_state *mrb, const struct RProc *proc, mrb_value self, mrb_int st
 }
 
 #if defined(MRB_USE_CXX_EXCEPTION) && defined(__cplusplus)
-# if !defined(MRB_USE_CXX_ABI)
-} /* end of extern "C" */
-# endif
 mrb_int mrb_jmpbuf_id = 0;
 #endif