diff --git a/liberty/LibertyReader.cc b/liberty/LibertyReader.cc
index 7f039351..da39bca3 100644
--- a/liberty/LibertyReader.cc
+++ b/liberty/LibertyReader.cc
@@ -651,8 +651,6 @@ LibertyReader::beginLibrary(LibertyGroup *group)
     library_->units()->currentUnit()->setScale(current_scale_);
     library_->units()->distanceUnit()->setScale(distance_scale_);
 
-
-    library_->setDelayModelType(DelayModelType::cmos_linear);
     scale_factors_ = new ScaleFactors("");
     library_->setScaleFactors(scale_factors_);
   }
diff --git a/util/StringUtil.cc b/util/StringUtil.cc
index 02c5edfc..a20ac4a8 100644
--- a/util/StringUtil.cc
+++ b/util/StringUtil.cc
@@ -158,6 +158,7 @@ stringPrintTmp(const char *fmt,
 
   if (tmp_length >= tmp_length1) {
     tmp_length1 = tmp_length + 1;
+    stringDelete(tmp);
     tmp = makeTmpString(tmp_length1);
     va_copy(args_copy, args);
     tmp_length = vsnprint(tmp, tmp_length1, fmt, args_copy);