diff --git a/package.json b/package.json
index 21f0a03..16dfc6f 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "mssql": "^3.3.0",
     "reflect-metadata": "^0.1.10",
     "typeorm": "0.0.10",
-    "typescript": "^2.3.2",
+    "typescript": "^2.3.3",
     "yargs": "^7.0.2"
   },
   "devDependencies": {
diff --git a/src/drivers/MssqlDriver.ts b/src/drivers/MssqlDriver.ts
index c90309b..338dcc2 100644
--- a/src/drivers/MssqlDriver.ts
+++ b/src/drivers/MssqlDriver.ts
@@ -15,9 +15,8 @@ export class MssqlDriver extends AbstractDriver {
                 console.error(`Table ${entity.EntityName} has no PK.`)
                 return;
             }
-            let pIndex = primaryIndex //typescript error? pIndex:IndexInfo; primaryIndex:IndexInfo|undefined
             entity.Columns.forEach(col => {
-                if (pIndex.columns.some(cIndex => cIndex.name == col.name)) col.isPrimary = true
+                if (primaryIndex!.columns.some(cIndex => cIndex.name == col.name)) col.isPrimary = true
             })
         });
     }