diff --git a/openair1/PHY/LTE_ESTIMATION/lte_sync_timefreq.c b/openair1/PHY/LTE_ESTIMATION/lte_sync_timefreq.c
index dc96fd80d7..87e3178fb7 100644
--- a/openair1/PHY/LTE_ESTIMATION/lte_sync_timefreq.c
+++ b/openair1/PHY/LTE_ESTIMATION/lte_sync_timefreq.c
@@ -49,6 +49,7 @@
 #include "pss6144.h"
 
 #define DEBUG_TF 1
+extern print_shorts(char*,__m128i*);
 
 void lte_sync_timefreq(PHY_VARS_UE *ue,int band,unsigned int DL_freq) {