diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 7a2ec512e5a..07a81967661 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -3157,7 +3157,7 @@ namespace ts {
         // Return the type implied by an object binding pattern
         function getTypeFromObjectBindingPattern(pattern: ObjectBindingPattern, includePatternInType: boolean, reportErrors: boolean): ResolvedType {
             const members = createMap<Symbol>();
-            let hasComputedProperties: boolean;
+            let hasComputedProperties = false;
             forEach(pattern.elements, e => {
                 const name = e.propertyName || <Identifier>e.name;
                 if (isComputedNonLiteralName(name)) {
@@ -10274,7 +10274,7 @@ namespace ts {
             const contextualTypeHasPattern = contextualType && contextualType.pattern &&
                 (contextualType.pattern.kind === SyntaxKind.ObjectBindingPattern || contextualType.pattern.kind === SyntaxKind.ObjectLiteralExpression);
             let typeFlags: TypeFlags = 0;
-            let patternWithComputedProperties: boolean | undefined;
+            let patternWithComputedProperties = false;
             let hasComputedStringProperty = false;
             let hasComputedNumberProperty = false;