diff --git a/src/proto/ex_eval.pro b/src/proto/ex_eval.pro
index f186161..f5037c9 100644
--- a/src/proto/ex_eval.pro
+++ b/src/proto/ex_eval.pro
@@ -22,6 +22,7 @@
 void ex_endwhile(exarg_T *eap);
 void ex_block(exarg_T *eap);
 void ex_endblock(exarg_T *eap);
+int inside_block(exarg_T *eap);
 void ex_throw(exarg_T *eap);
 void do_throw(cstack_T *cstack);
 void ex_try(exarg_T *eap);