diff --git a/src/teliva.h b/src/teliva.h
index 3f9072b..a7fb084 100644
--- a/src/teliva.h
+++ b/src/teliva.h
@@ -162,6 +162,7 @@ extern void load_editor_buffer_to_current_definition_in_image(lua_State* L);
 extern int load_editor_buffer_to_current_definition_in_image_and_reload(lua_State* L);
 extern void save_to_current_definition_and_editor_buffer(lua_State* L, const char* definition);
 extern void save_editor_state(int rowoff, int coloff, int cy, int cx);
+int editor_view_in_progress(lua_State* L);
 
 extern void assign_call_graph_depth_to_name(lua_State* L, int depth, const char* name);
 extern char* caller(lua_State* L);