diff --git a/include/mruby/throw.h b/include/mruby/throw.h
index 52171e9b0..8ec1aa7ae 100644
--- a/include/mruby/throw.h
+++ b/include/mruby/throw.h
@@ -52,14 +52,15 @@ typedef mrb_int mrb_jmpbuf_impl;
 
 #endif
 
+#if defined(MRB_USE_CXX_EXCEPTION)
+extern mrb_int mrb_jmpbuf_id;
+#endif
+
 struct mrb_jmpbuf {
   mrb_jmpbuf_impl impl;
 
 #if defined(MRB_USE_CXX_EXCEPTION)
-  static mrb_int jmpbuf_id;
-# if defined(__cplusplus)
-  mrb_jmpbuf() : impl(jmpbuf_id++) {}
-# endif
+  mrb_jmpbuf() : impl(mrb_jmpbuf_id++) {}
 #endif
 };
 
diff --git a/src/vm.c b/src/vm.c
index 553e68b11..586585079 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -3127,5 +3127,5 @@ mrb_top_run(mrb_state *mrb, const struct RProc *proc, mrb_value self, mrb_int st
 # if !defined(MRB_USE_CXX_ABI)
 } /* end of extern "C" */
 # endif
-mrb_int mrb_jmpbuf::jmpbuf_id = 0;
+mrb_int mrb_jmpbuf_id = 0;
 #endif