diff --git a/packages/compiler/src/chars.ts b/packages/compiler/src/chars.ts
index 4bb0a4ec4a..5ba122d803 100644
--- a/packages/compiler/src/chars.ts
+++ b/packages/compiler/src/chars.ts
@@ -98,7 +98,3 @@ export function isNewLine(code: number): boolean {
 export function isOctalDigit(code: number): boolean {
   return $0 <= code && code <= $7;
 }
-
-export function isQuote(code: number): boolean {
-  return code === $SQ || code === $DQ || code === $BT;
-}
diff --git a/packages/compiler/src/expression_parser/lexer.ts b/packages/compiler/src/expression_parser/lexer.ts
index 103e32f78c..39372a4b07 100644
--- a/packages/compiler/src/expression_parser/lexer.ts
+++ b/packages/compiler/src/expression_parser/lexer.ts
@@ -436,6 +436,10 @@ function isExponentSign(code: number): boolean {
   return code == chars.$MINUS || code == chars.$PLUS;
 }
 
+export function isQuote(code: number): boolean {
+  return code === chars.$SQ || code === chars.$DQ || code === chars.$BT;
+}
+
 function unescape(code: number): number {
   switch (code) {
     case chars.$n:
diff --git a/packages/compiler/src/expression_parser/parser.ts b/packages/compiler/src/expression_parser/parser.ts
index 1c0f105794..7fc84c14ae 100644
--- a/packages/compiler/src/expression_parser/parser.ts
+++ b/packages/compiler/src/expression_parser/parser.ts
@@ -10,7 +10,7 @@ import * as chars from '../chars';
 import {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../ml_parser/interpolation_config';
 
 import {AbsoluteSourceSpan, AST, AstVisitor, ASTWithSource, Binary, BindingPipe, Chain, Conditional, EmptyExpr, ExpressionBinding, FunctionCall, ImplicitReceiver, Interpolation, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, LiteralMapKey, LiteralPrimitive, MethodCall, NonNullAssert, ParserError, ParseSpan, PrefixNot, PropertyRead, PropertyWrite, Quote, RecursiveAstVisitor, SafeKeyedRead, SafeMethodCall, SafePropertyRead, TemplateBinding, TemplateBindingIdentifier, ThisReceiver, Unary, VariableBinding} from './ast';
-import {EOF, isIdentifier, Lexer, Token, TokenType} from './lexer';
+import {EOF, isIdentifier, isQuote, Lexer, Token, TokenType} from './lexer';
 
 export interface InterpolationPiece {
   text: string;
@@ -291,7 +291,7 @@ export class Parser {
 
       if (outerQuote === char) {
         outerQuote = null;
-      } else if (outerQuote == null && chars.isQuote(char)) {
+      } else if (outerQuote == null && isQuote(char)) {
         outerQuote = char;
       }
     }
@@ -355,7 +355,7 @@ export class Parser {
       const char = input[i];
       // Skip the characters inside quotes. Note that we only care about the outer-most
       // quotes matching up and we need to account for escape characters.
-      if (chars.isQuote(input.charCodeAt(i)) && (currentQuote === null || currentQuote === char) &&
+      if (isQuote(input.charCodeAt(i)) && (currentQuote === null || currentQuote === char) &&
           escapeCount % 2 === 0) {
         currentQuote = currentQuote === null ? char : null;
       } else if (currentQuote === null) {