diff --git a/openair1/SCHED/phy_procedures_lte_common.c b/openair1/SCHED/phy_procedures_lte_common.c
index fc63c12b8e..83ba5b4b97 100644
--- a/openair1/SCHED/phy_procedures_lte_common.c
+++ b/openair1/SCHED/phy_procedures_lte_common.c
@@ -336,7 +336,7 @@ unsigned char ul_ACK_subframe2_dl_subframe(LTE_DL_FRAME_PARMS *frame_parms,unsig
   return(0);
 }
 
-unsigned char ul_ACK_subframe2_dl_frame(LTE_DL_FRAME_PARMS *frame_parms,int frame, unsigned char subframe,unsigned char subframe_tx)
+int ul_ACK_subframe2_dl_frame(LTE_DL_FRAME_PARMS *frame_parms,int frame, unsigned char subframe,unsigned char subframe_tx)
 {
 
   if (frame_parms->frame_type == FDD) {