diff --git a/lib/src/phy/ch_estimation/test/chest_test_sl.c b/lib/src/phy/ch_estimation/test/chest_test_sl.c
index 552ed3fba..6ba70d9a3 100644
--- a/lib/src/phy/ch_estimation/test/chest_test_sl.c
+++ b/lib/src/phy/ch_estimation/test/chest_test_sl.c
@@ -109,6 +109,7 @@ int main(int argc, char** argv)
 
   // Variables init Tx
   srslte_chest_sl_t q;
+  memset(q, 0, sizeof(q));
 
   if (run_psbch_test) {
     // Tx