diff --git a/src/services/symbolDisplay.ts b/src/services/symbolDisplay.ts
index 516b5d7fbc5..b32bd8f331d 100644
--- a/src/services/symbolDisplay.ts
+++ b/src/services/symbolDisplay.ts
@@ -272,11 +272,9 @@ namespace ts.SymbolDisplay {
             displayParts.push(punctuationPart(SyntaxKind.CloseParenToken));
             displayParts.push(spacePart());
             addFullSymbolName(symbol);
-            displayParts.push(spacePart());
-            displayParts.push(keywordPart(SyntaxKind.InKeyword));
-            displayParts.push(spacePart());
             if (symbol.parent) {
                 // Class/Interface type parameter
+                addInPrefix();
                 addFullSymbolName(symbol.parent, enclosingDeclaration);
                 writeTypeParametersOfSymbol(symbol.parent, enclosingDeclaration);
             }
@@ -288,6 +286,7 @@ namespace ts.SymbolDisplay {
 
                 if (declaration) {
                     if (isFunctionLikeKind(declaration.kind)) {
+                        addInPrefix();
                         const signature = typeChecker.getSignatureFromDeclaration(<SignatureDeclaration>declaration);
                         if (declaration.kind === SyntaxKind.ConstructSignature) {
                             displayParts.push(keywordPart(SyntaxKind.NewKeyword));
@@ -298,10 +297,11 @@ namespace ts.SymbolDisplay {
                         }
                         addRange(displayParts, signatureToDisplayParts(typeChecker, signature, sourceFile, TypeFormatFlags.WriteTypeArgumentsOfSignature));
                     }
-                    else {
+                    else if (declaration.kind === SyntaxKind.TypeAliasDeclaration) {
                         // Type alias type parameter
                         // For example
                         //      type list<T> = T[];  // Both T will go through same code path
+                        addInPrefix();
                         displayParts.push(keywordPart(SyntaxKind.TypeKeyword));
                         displayParts.push(spacePart());
                         addFullSymbolName(declaration.symbol);
@@ -439,6 +439,12 @@ namespace ts.SymbolDisplay {
             }
         }
 
+        function addInPrefix() {
+            displayParts.push(spacePart());
+            displayParts.push(keywordPart(SyntaxKind.InKeyword));
+            displayParts.push(spacePart());
+        }
+
         function addFullSymbolName(symbol: Symbol, enclosingDeclaration?: Node) {
             const fullSymbolDisplayParts = symbolToDisplayParts(typeChecker, symbol, enclosingDeclaration || sourceFile, /*meaning*/ undefined,
                 SymbolFormatFlags.WriteTypeParametersOrArguments | SymbolFormatFlags.UseOnlyExternalAliasing);