diff --git a/lib/provider/tslintjson.ts b/lib/provider/tslintjson.ts
index 7b8f978..cb027b0 100644
--- a/lib/provider/tslintjson.ts
+++ b/lib/provider/tslintjson.ts
@@ -22,7 +22,8 @@ export async function makeFormatCodeOptions(fileName: string, opts: Options, for
     const whitespace = rules.get("whitespace");
 
     if (indent && indent.ruleArguments) {
-        switch (indent.ruleArguments[0]) {
+        const [character, size] = indent.ruleArguments;
+        switch (character) {
             case "spaces":
                 formatSettings.convertTabsToSpaces = true;
                 break;
@@ -32,6 +33,9 @@ export async function makeFormatCodeOptions(fileName: string, opts: Options, for
             default:
                 break;
         }
+        if (typeof size === 'number') {
+            formatSettings.indentSize = size;
+        }
     }
     if (whitespace && whitespace.ruleArguments) {
         for (let p in whitespace.ruleArguments) {