diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
index 09b64701988..77f4d7c6e1f 100644
--- a/src/compiler/tsc.ts
+++ b/src/compiler/tsc.ts
@@ -22,7 +22,7 @@ namespace ts {
     }
 
     let reportDiagnostic = createDiagnosticReporter(sys);
-    function udpateReportDiagnostic(options: CompilerOptions) {
+    function updateReportDiagnostic(options: CompilerOptions) {
         if (options.pretty) {
             reportDiagnostic = createDiagnosticReporter(sys, /*pretty*/ true);
         }
@@ -111,7 +111,7 @@ namespace ts {
         const commandLineOptions = commandLine.options;
         if (configFileName) {
             const configParseResult = parseConfigFileWithSystem(configFileName, commandLineOptions, sys, reportDiagnostic);
-            udpateReportDiagnostic(configParseResult.options);
+            updateReportDiagnostic(configParseResult.options);
             if (isWatchSet(configParseResult.options)) {
                 reportWatchModeWithoutSysSupport();
                 createWatchOfConfigFile(configParseResult, commandLineOptions);
@@ -121,7 +121,7 @@ namespace ts {
             }
         }
         else {
-            udpateReportDiagnostic(commandLineOptions);
+            updateReportDiagnostic(commandLineOptions);
             if (isWatchSet(commandLineOptions)) {
                 reportWatchModeWithoutSysSupport();
                 createWatchOfFilesAndCompilerOptions(commandLine.fileNames, commandLineOptions);