diff --git a/wpa_supplicant/mbo.c b/wpa_supplicant/mbo.c
index 883c95e4a..1af18908d 100644
--- a/wpa_supplicant/mbo.c
+++ b/wpa_supplicant/mbo.c
@@ -609,7 +609,7 @@ void wpas_mbo_update_cell_capa(struct wpa_supplicant *wpa_s, u8 mbo_cell_capa)
 	wpas_update_mbo_connect_params(wpa_s);
 }
 
-
+#ifdef CONFIG_GAS
 struct wpabuf * mbo_build_anqp_buf(struct wpa_supplicant *wpa_s,
 				   struct wpa_bss *bss, u32 mbo_subtypes)
 {
@@ -645,7 +645,7 @@ struct wpabuf * mbo_build_anqp_buf(struct wpa_supplicant *wpa_s,
 
 	return anqp_buf;
 }
-
+#endif /* CONFIG_GAS */
 
 void mbo_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
 			    struct wpa_bss *bss, const u8 *sa,
diff --git a/wpa_supplicant/wpa_supplicant_i.h b/wpa_supplicant/wpa_supplicant_i.h
index da69173ea..9b96f3274 100644
--- a/wpa_supplicant/wpa_supplicant_i.h
+++ b/wpa_supplicant/wpa_supplicant_i.h
@@ -1702,8 +1702,10 @@ size_t wpas_mbo_ie_bss_trans_reject(struct wpa_supplicant *wpa_s, u8 *pos,
 				    size_t len,
 				    enum mbo_transition_reject_reason reason);
 void wpas_mbo_update_cell_capa(struct wpa_supplicant *wpa_s, u8 mbo_cell_capa);
+#ifdef CONFIG_GAS
 struct wpabuf * mbo_build_anqp_buf(struct wpa_supplicant *wpa_s,
 				   struct wpa_bss *bss, u32 mbo_subtypes);
+#endif /* CONFIG_GAS */
 void mbo_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
 			    struct wpa_bss *bss, const u8 *sa,
 			    const u8 *data, size_t slen);