diff --git a/lib/_http_agent.js b/lib/_http_agent.js
index e23409f2ee797f..a4829526f6e138 100644
--- a/lib/_http_agent.js
+++ b/lib/_http_agent.js
@@ -38,7 +38,7 @@ const {
   StringPrototypeIndexOf,
   StringPrototypeSplit,
   StringPrototypeStartsWith,
-  StringPrototypeSubstr,
+  StringPrototypeSubstring,
   Symbol,
 } = primordials;
 
@@ -363,7 +363,7 @@ function calculateServerName(options, req) {
         // Leading '[', but no ']'. Need to do something...
         servername = hostHeader;
       } else {
-        servername = StringPrototypeSubstr(hostHeader, 1, index - 1);
+        servername = StringPrototypeSubstring(hostHeader, 1, index);
       }
     } else {
       servername = StringPrototypeSplit(hostHeader, ':', 1)[0];
diff --git a/lib/internal/main/print_help.js b/lib/internal/main/print_help.js
index edb861668cac3d..73227fbd9cb456 100644
--- a/lib/internal/main/print_help.js
+++ b/lib/internal/main/print_help.js
@@ -11,7 +11,7 @@ const {
   RegExpPrototypeSymbolReplace,
   StringPrototypeLocaleCompare,
   StringPrototypeSlice,
-  StringPrototypeTrimLeft,
+  StringPrototypeTrimStart,
   StringPrototypeRepeat,
   SafeMap,
 } = primordials;
@@ -180,7 +180,7 @@ function format(
     else
       text += StringPrototypeRepeat(' ', firstColumn - displayName.length);
 
-    text += StringPrototypeTrimLeft(
+    text += StringPrototypeTrimStart(
       indent(fold(displayHelpText, secondColumn), firstColumn)) + '\n';
   }
 
diff --git a/lib/repl.js b/lib/repl.js
index d8021215b3f425..3029c94b1e1ac0 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -90,7 +90,7 @@ const {
   StringPrototypeSplit,
   StringPrototypeStartsWith,
   StringPrototypeTrim,
-  StringPrototypeTrimLeft,
+  StringPrototypeTrimStart,
   StringPrototypeToLocaleLowerCase,
   Symbol,
   SyntaxError,
@@ -1326,7 +1326,7 @@ function complete(line, callback) {
   let completeOn, group;
 
   // Ignore right whitespace. It could change the outcome.
-  line = StringPrototypeTrimLeft(line);
+  line = StringPrototypeTrimStart(line);
 
   let filter = '';