diff --git a/packages/parser/package.json b/packages/parser/package.json
index adad04cd1c8..27d1104f461 100644
--- a/packages/parser/package.json
+++ b/packages/parser/package.json
@@ -6,6 +6,7 @@
   "types": "dist/index.d.ts",
   "files": [
     "dist",
+    "_ts3.4",
     "README.md",
     "LICENSE"
   ],
diff --git a/packages/types/package.json b/packages/types/package.json
index 71eaf2ffe21..b76f433577f 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -12,6 +12,7 @@
   },
   "files": [
     "dist",
+    "_ts3.4",
     "package.json",
     "README.md",
     "LICENSE"
diff --git a/packages/typescript-estree/package.json b/packages/typescript-estree/package.json
index 862516f3fc0..ef3c7b184b5 100644
--- a/packages/typescript-estree/package.json
+++ b/packages/typescript-estree/package.json
@@ -6,6 +6,7 @@
   "types": "dist/index.d.ts",
   "files": [
     "dist",
+    "_ts3.4",
     "README.md",
     "LICENSE"
   ],
diff --git a/packages/visitor-keys/package.json b/packages/visitor-keys/package.json
index 2298805ffd6..115914a0025 100644
--- a/packages/visitor-keys/package.json
+++ b/packages/visitor-keys/package.json
@@ -12,6 +12,7 @@
   },
   "files": [
     "dist",
+    "_ts3.4",
     "package.json",
     "README.md",
     "LICENSE"