diff --git a/ROADMAP.md b/ROADMAP.md
index 818aaad..4eb18a3 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -142,7 +142,7 @@
 - [ ] "no-misleading-character-class"
 - [ ] "no-mixed-operators"
 - [ ] "no-mixed-requires"
-- [ ] "no-mixed-spaces-and-tabs"
+- [X] "no-mixed-spaces-and-tabs"
 - [ ] "no-multi-assign"
 - [X] "no-multi-spaces"
 - [ ] "no-multi-str"
diff --git a/src/rules/default.json b/src/rules/default.json
index fb92019..d3b3cb1 100644
--- a/src/rules/default.json
+++ b/src/rules/default.json
@@ -214,6 +214,10 @@
       "ignoreArrayIndexes": false
     }
   ],
+  "no-mixed-spaces-and-tabs": [
+    "error",
+    "smart-tabs"
+  ],
   "no-multi-spaces": [
     "error",
     {