diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 2ca169cb140..48a5933a59a 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -1308,7 +1308,7 @@ namespace ts {
 
         /**
          * Resolves a qualified name and any involved aliases.
-         */ 
+         */
         function resolveEntityName(name: EntityNameOrEntityNameExpression, meaning: SymbolFlags, ignoreErrors?: boolean, dontResolveAlias?: boolean, location?: Node): Symbol | undefined {
             if (nodeIsMissing(name)) {
                 return undefined;
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index 5f4465f490e..736b8d11a01 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1370,7 +1370,7 @@ namespace ts {
         const missingMembers = getMissingInterfaceMembers(<InterfaceDeclaration>type.symbol.declarations[0], existingMembers, checker);
 
         for (const member of missingMembers) {
-            if (member.kind === SyntaxKind.PropertySignature) {
+            if (member.kind === SyntaxKind.PropertySignature || member.kind === SyntaxKind.PropertyDeclaration) {
                 const interfaceProperty = <PropertySignature>member;
                 if (trackingAddedMembers.indexOf(interfaceProperty.name.getText()) === -1) {
                     let propertyText = "";
@@ -1405,25 +1405,24 @@ namespace ts {
      * Gets members in an interface and all its base types.
      */
     function getInterfaceMembers(declaration: InterfaceDeclaration, checker: TypeChecker): TypeElement[] {
+        let result: TypeElement[]  = declaration.members
+            ? declaration.members.filter(member => !(getModifierFlags(member) & ModifierFlags.Private))
+            : [];
         const clauses = getInterfaceBaseTypeNodes(declaration);
-        let result: TypeElement[] = [];
-        for (let i = 0; clauses && i < clauses.length; i++) {
-            const type = checker.getTypeAtLocation(clauses[i]);
-            if (type && type.symbol && type.symbol.declarations) {
-                result = result.concat(getInterfaceMembers(<InterfaceDeclaration>type.symbol.declarations[0], checker));
+        if (clauses) {
+            for (const clause of clauses) {
+                const type = checker.getTypeAtLocation(clause);
+                if (type && type.symbol && type.symbol.declarations) {
+                    result = result.concat(getInterfaceMembers(<InterfaceDeclaration>type.symbol.declarations[0], checker));
+                }
             }
         }
 
-        if (declaration.members) {
-            result = result.concat(declaration.members);
-        }
-
         return result;
     }
 
     function getMissingInterfaceMembers(declaration: InterfaceDeclaration, existingMembers: string[], checker: TypeChecker): TypeElement[] {
         const interfaceMembers = getInterfaceMembers(declaration, checker);
-
         return ts.filter(interfaceMembers, member => !member.name || existingMembers.indexOf(member.name.getText()) === -1);
 
     }
diff --git a/tests/cases/fourslash/codeFixClassExtendsAbstractNumber.ts b/tests/cases/fourslash/codeFixClassExtendsAbstractNumber.ts
index 134c1979dce..f57017693cd 100644
--- a/tests/cases/fourslash/codeFixClassExtendsAbstractNumber.ts
+++ b/tests/cases/fourslash/codeFixClassExtendsAbstractNumber.ts
@@ -7,5 +7,6 @@
 //// class C extends A {[|
 //// |]}
 
-verify.codeFixAtPosition(`x: number;
+verify.codeFixAtPosition(`
+abstract x: number;
 `);
diff --git a/tests/cases/fourslash/codeFixClassExtendsAbstractProtectedNumber.ts b/tests/cases/fourslash/codeFixClassExtendsAbstractProtectedNumber.ts
index 7f525632fc5..2f1a0f4b64e 100644
--- a/tests/cases/fourslash/codeFixClassExtendsAbstractProtectedNumber.ts
+++ b/tests/cases/fourslash/codeFixClassExtendsAbstractProtectedNumber.ts
@@ -7,5 +7,6 @@
 //// class C extends A {[|
 //// |]}
 
-verify.codeFixAtPosition(`protected x: number;
+verify.codeFixAtPosition(`
+protected abstract x: number;
 `);
diff --git a/tests/cases/fourslash/codeFixClassExtendsAbstractPublicNumber.ts b/tests/cases/fourslash/codeFixClassExtendsAbstractPublicNumber.ts
index 82cafbd86ad..380f23f6c58 100644
--- a/tests/cases/fourslash/codeFixClassExtendsAbstractPublicNumber.ts
+++ b/tests/cases/fourslash/codeFixClassExtendsAbstractPublicNumber.ts
@@ -7,5 +7,6 @@
 //// class C extends A {[|
 //// |]}
 
-verify.codeFixAtPosition(`public x: number;
+verify.codeFixAtPosition(`
+public abstract x: number;
 `);
\ No newline at end of file
diff --git a/tests/cases/fourslash/codeFixUnimplementedInterfaceMissingMultipleFunctionsDeepInheritance.ts b/tests/cases/fourslash/codeFixUnimplementedInterfaceMissingMultipleFunctionsDeepInheritance.ts
index 729df3a91c8..fcb990ac27f 100644
--- a/tests/cases/fourslash/codeFixUnimplementedInterfaceMissingMultipleFunctionsDeepInheritance.ts
+++ b/tests/cases/fourslash/codeFixUnimplementedInterfaceMissingMultipleFunctionsDeepInheritance.ts
@@ -53,10 +53,11 @@
 
 
 verify.codeFixAtPosition(
-`a: number;
-b: number;
-c: number;
-d: number;
-e: number:
+`
+e: number;
 f: number;
+a: number;
+b: number;
+d: number;
+c: number;
 `);