diff --git a/libbbfdm/dmtree/tr143/diagnostics.c b/libbbfdm/dmtree/tr143/diagnostics.c
index 3b1988ae..63aab21c 100644
--- a/libbbfdm/dmtree/tr143/diagnostics.c
+++ b/libbbfdm/dmtree/tr143/diagnostics.c
@@ -406,7 +406,7 @@ static int set_IPDiagnosticsTraceRoute_Timeout(char *refparam, struct dmctx *ctx
 
 static int get_IPDiagnosticsTraceRoute_DataBlockSize(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
 {
-	*value = get_diagnostics_option_fallback_def("traceroute", "DataBlockSize", "72");
+	*value = get_diagnostics_option_fallback_def("traceroute", "DataBlockSize", "38");
 	return 0;
 }
 
diff --git a/libbbfdm/scripts/traceroute b/libbbfdm/scripts/traceroute
index 2d3d4028..269d8df6 100755
--- a/libbbfdm/scripts/traceroute
+++ b/libbbfdm/scripts/traceroute
@@ -77,7 +77,7 @@ traceroute_launch() {
 		return
 	}
 	
-	[ -z "${dsize}" ] && dsize="72"
+	[ -z "${dsize}" ] && dsize="38"
 
 	res=$(traceroute -m ${maxhop} -w ${timeout} -q ${cnt} ${ip_proto} ${device} "${host}" "${dsize}" 2>&1 >"${LOG_FILE}")
 	error_code="$?"