diff --git a/packages/wouter-preact/package.json b/packages/wouter-preact/package.json
index 147c5a7..c176c85 100644
--- a/packages/wouter-preact/package.json
+++ b/packages/wouter-preact/package.json
@@ -17,6 +17,7 @@
     "types/**/*.d.ts",
     "types/*.d.ts"
   ],
+  "main": "esm/index.js",
   "exports": {
     ".": {
       "types": "./types/index.d.ts",
diff --git a/packages/wouter/package.json b/packages/wouter/package.json
index bd8512c..50f5327 100644
--- a/packages/wouter/package.json
+++ b/packages/wouter/package.json
@@ -17,6 +17,7 @@
     "types/**/*.d.ts",
     "types/*.d.ts"
   ],
+  "main": "esm/index.js",
   "exports": {
     ".": {
       "types": "./types/index.d.ts",