diff --git a/api/units/data_rate.cc b/api/units/data_rate.cc
index edc1d22e4c..f9586c5f40 100644
--- a/api/units/data_rate.cc
+++ b/api/units/data_rate.cc
@@ -18,8 +18,10 @@ namespace webrtc {
 std::string ToString(DataRate value) {
   char buf[64];
   rtc::SimpleStringBuilder sb(buf);
-  if (value.IsInfinite()) {
-    sb << "inf bps";
+  if (value.IsPlusInfinity()) {
+    sb << "+inf bps";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf bps";
   } else {
     if (value.bps() == 0 || value.bps() % 1000 != 0) {
       sb << value.bps() << " bps";
diff --git a/api/units/data_size.cc b/api/units/data_size.cc
index bec57d04f4..45487dfd83 100644
--- a/api/units/data_size.cc
+++ b/api/units/data_size.cc
@@ -18,8 +18,10 @@ namespace webrtc {
 std::string ToString(DataSize value) {
   char buf[64];
   rtc::SimpleStringBuilder sb(buf);
-  if (value.IsInfinite()) {
-    sb << "inf bytes";
+  if (value.IsPlusInfinity()) {
+    sb << "+inf bytes";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf bytes";
   } else {
     sb << value.bytes() << " bytes";
   }
diff --git a/api/units/timestamp.cc b/api/units/timestamp.cc
index c9b6e22ae0..0b9cdd9a21 100644
--- a/api/units/timestamp.cc
+++ b/api/units/timestamp.cc
@@ -17,8 +17,10 @@ namespace webrtc {
 std::string ToString(Timestamp value) {
   char buf[64];
   rtc::SimpleStringBuilder sb(buf);
-  if (value.IsInfinite()) {
-    sb << "inf ms";
+  if (value.IsPlusInfinity()) {
+    sb << "+inf ms";
+  } else if (value.IsMinusInfinity()) {
+    sb << "-inf ms";
   } else {
     if (value.ms() % 1000 == 0)
       sb << value.seconds() << " s";