diff --git a/gatchat/ppp_cp.c b/gatchat/ppp_cp.c
index 99583d36..dd56d71c 100644
--- a/gatchat/ppp_cp.c
+++ b/gatchat/ppp_cp.c
@@ -1284,6 +1284,11 @@ gpointer pppcp_get_data(struct pppcp_data *pppcp)
 	return pppcp->priv;
 }
 
+void pppcp_set_option_strings(struct pppcp_data *pppcp, const char **opts)
+{
+	pppcp->option_strings = opts;
+}
+
 struct pppcp_data *pppcp_new(GAtPPP *ppp, guint16 proto)
 {
 	struct pppcp_data *data;
diff --git a/gatchat/ppp_cp.h b/gatchat/ppp_cp.h
index 9e74f253..5798fbeb 100644
--- a/gatchat/ppp_cp.h
+++ b/gatchat/ppp_cp.h
@@ -106,6 +106,8 @@ void pppcp_free(struct pppcp_data *data);
 void pppcp_set_data(struct pppcp_data *pppcp, gpointer data);
 gpointer pppcp_get_data(struct pppcp_data *pppcp);
 
+void pppcp_set_option_strings(struct pppcp_data *pppcp, const char **opts);
+
 void pppcp_add_config_option(struct pppcp_data *data,
 				struct ppp_option *option);
 void pppcp_set_valid_codes(struct pppcp_data *data, guint16 codes);
diff --git a/gatchat/ppp_ipcp.c b/gatchat/ppp_ipcp.c
index e81c6b72..49cf950f 100644
--- a/gatchat/ppp_ipcp.c
+++ b/gatchat/ppp_ipcp.c
@@ -195,7 +195,7 @@ struct pppcp_data *ipcp_new(GAtPPP *ppp)
 		return NULL;
 	}
 
-	pppcp->option_strings = ipcp_option_strings;
+	pppcp_set_option_strings(pppcp, ipcp_option_strings);
 	pppcp->prefix = "ipcp";
 
 	pppcp_set_valid_codes(pppcp, IPCP_SUPPORTED_CODES);
diff --git a/gatchat/ppp_lcp.c b/gatchat/ppp_lcp.c
index 2431aea8..8ad70d82 100644
--- a/gatchat/ppp_lcp.c
+++ b/gatchat/ppp_lcp.c
@@ -230,7 +230,7 @@ struct pppcp_data *lcp_new(GAtPPP *ppp)
 		return NULL;
 	}
 
-	pppcp->option_strings = lcp_option_strings;
+	pppcp_set_option_strings(pppcp, lcp_option_strings);
 	pppcp->prefix = "lcp";
 
 	pppcp_set_valid_codes(pppcp, LCP_SUPPORTED_CODES);