diff --git a/include/openbsc/gprs_gmm.h b/include/openbsc/gprs_gmm.h
index d210a35..c38e49f 100644
--- a/include/openbsc/gprs_gmm.h
+++ b/include/openbsc/gprs_gmm.h
@@ -30,6 +30,6 @@
 
 time_t gprs_max_time_to_idle(void);
 
-int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp, bool use_x213_nsap);
+int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp);
 
 #endif /* _GPRS_GMM_H */