diff --git a/include/environment.h b/include/environment.h
index 70b7eda..2fe1f3e 100644
--- a/include/environment.h
+++ b/include/environment.h
@@ -275,7 +275,7 @@
 void set_default_env(const char *s);
 
 /* [re]set individual variables to their value in the default environment */
-int set_default_vars(int nvars, char * const vars[]);
+int set_default_vars(int nvars, char * const vars[], int flags);
 
 /* Import from binary representation into hash table */
 int env_import(const char *buf, int check);