diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 352e6843a8295..16638633fac9b 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -9645,7 +9645,8 @@ namespace ts {
                 }
                 else {
                     stringIndexInfo = baseConstructorIndexInfo;
-                    if (symbol.flags & SymbolFlags.Enum && (getDeclaredTypeOfSymbol(symbol).flags & TypeFlags.Enum || some(type.properties, prop => !!(getTypeOfSymbol(prop).flags & TypeFlags.NumberLike))) ) {
+                    if (symbol.flags & SymbolFlags.Enum && (getDeclaredTypeOfSymbol(symbol).flags & TypeFlags.Enum ||
+                        some(type.properties, prop => !!(getTypeOfSymbol(prop).flags & TypeFlags.NumberLike)))) {
                         numberIndexInfo = enumNumberIndexInfo;
                     }
                 }
@@ -9680,7 +9681,7 @@ namespace ts {
             const declaration = getIndexDeclarationOfIndexSymbol(indexSymbol, indexKind);
             if (!declaration) return undefined;
             return createIndexInfo(declaration.type ? getTypeFromTypeNode(declaration.type) : anyType,
-                    hasModifier(declaration, ModifierFlags.Readonly), declaration); 
+                hasModifier(declaration, ModifierFlags.Readonly), declaration);
         }
 
         function resolveReverseMappedTypeMembers(type: ReverseMappedType) {
diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 6a85b4a3b08cb..ae13b11389779 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -2824,10 +2824,6 @@ namespace ts {
         }
 
         function isIndexSignature(): boolean {
-            return token() === SyntaxKind.StaticKeyword ? lookAhead(isNonStaticIndexSignature) : isNonStaticIndexSignature()
-        }
-
-        function isNonStaticIndexSignature(): boolean {
             return token() === SyntaxKind.OpenBracketToken && lookAhead(isUnambiguouslyIndexSignature);
         }
 
@@ -2888,7 +2884,6 @@ namespace ts {
 
         function parseIndexSignatureDeclaration(node: IndexSignatureDeclaration): IndexSignatureDeclaration {
             node.kind = SyntaxKind.IndexSignature;
-            node.staticModifier = parseOptionalToken(SyntaxKind.StaticKeyword);
             node.parameters = parseBracketedList(ParsingContext.Parameters, parseParameter, SyntaxKind.OpenBracketToken, SyntaxKind.CloseBracketToken);
             node.type = parseTypeAnnotation();
             parseTypeMemberSemicolon();
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index e0fa8af7352da..3add4e354ae28 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -1184,7 +1184,6 @@ namespace ts {
     export interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
         kind: SyntaxKind.IndexSignature;
         parent: ObjectTypeDeclaration;
-        staticModifier?: Token<SyntaxKind.StaticKeyword>;
     }
 
     export interface TypeNode extends Node {
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index bf37d5204be73..0ba337629e70b 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -752,7 +752,6 @@ declare namespace ts {
     export interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
         kind: SyntaxKind.IndexSignature;
         parent: ObjectTypeDeclaration;
-        staticModifier?: Token<SyntaxKind.StaticKeyword>;
     }
     export interface TypeNode extends Node {
         _typeNodeBrand: any;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 7673c6c44ffa6..06e81bd224a91 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -752,7 +752,6 @@ declare namespace ts {
     export interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
         kind: SyntaxKind.IndexSignature;
         parent: ObjectTypeDeclaration;
-        staticModifier?: Token<SyntaxKind.StaticKeyword>;
     }
     export interface TypeNode extends Node {
         _typeNodeBrand: any;