diff --git a/ci-scripts/conf_files/enb.band7.tm1.fr1.25PRB.usrpb210.conf b/ci-scripts/conf_files/enb.band7.tm1.fr1.25PRB.usrpb210.conf
index 19e4abdcb0..33aae14dac 100755
--- a/ci-scripts/conf_files/enb.band7.tm1.fr1.25PRB.usrpb210.conf
+++ b/ci-scripts/conf_files/enb.band7.tm1.fr1.25PRB.usrpb210.conf
@@ -266,7 +266,7 @@ RUs = (
     max_pdschReferenceSignalPower = -27;
     max_rxgain                    = 118;
     eNB_instances  = [0];
-    clock_src      = "external";
+#    clock_src      = "external";
   }
 );  
 
diff --git a/ci-scripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf b/ci-scripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf
index 0d9691966b..5864e9ba3e 100755
--- a/ci-scripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf
+++ b/ci-scripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf
@@ -260,7 +260,7 @@ RUs = (
          max_pdschReferenceSignalPower = -27;
          max_rxgain                    = 114;
          eNB_instances  = [0];
-         clock_src = "external";
+#         clock_src = "external";
     }
 );