diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
index 68e85d3f71d..a3755650aed 100644
--- a/src/compiler/tsc.ts
+++ b/src/compiler/tsc.ts
@@ -88,11 +88,11 @@ module ts {
         if (diagnostic.file) {
             var loc = getLineAndCharacterOfPosition(diagnostic.file, diagnostic.start);
 
-            output += diagnostic.file.fileName + "(" + (loc.line + 1) + "," + (loc.character + 1) + "): ";
+            output += `${ diagnostic.file.fileName }(${ loc.line + 1 },${ loc.character + 1 }): `;
         }
 
         var category = DiagnosticCategory[diagnostic.category].toLowerCase();
-        output += category + " TS" + diagnostic.code + ": " + flattenDiagnosticMessageText(diagnostic.messageText, sys.newLine) + sys.newLine;
+        output += `${ category } TS${ diagnostic.code }: ${ flattenDiagnosticMessageText(diagnostic.messageText, sys.newLine) }${ sys.newLine }`;
 
         sys.write(output);
     }
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 6b336544eba..6a85a5d7a78 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -114,7 +114,7 @@ module ts {
     export function nodePosToString(node: Node): string {
         var file = getSourceFileOfNode(node);
         var loc = getLineAndCharacterOfPosition(file, node.pos);
-        return file.fileName + "(" + (loc.line + 1) + "," + (loc.character + 1) + ")";
+        return `${ file.fileName }(${ loc.line + 1 },${ loc.character + 1 })`;
     }
 
     export function getStartPosOfNode(node: Node): number {
diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index e40a367074d..cfc5da02f88 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -396,7 +396,7 @@ module FourSlash {
 
             var lineStarts = ts.computeLineStarts(this.getFileContent(this.activeFile.fileName));
             var lineCharPos = ts.computeLineAndCharacterOfPosition(lineStarts, pos);
-            this.scenarioActions.push('<MoveCaretToLineAndChar LineNumber="' + (lineCharPos.line + 1) + '" CharNumber="' + (lineCharPos.character + 1) + '" />');
+            this.scenarioActions.push(`<MoveCaretToLineAndChar LineNumber=${ lineCharPos.line + 1 } CharNumber=${ lineCharPos.character + 1 } />`);
         }
 
         public moveCaretRight(count = 1) {