diff --git a/packages/wouter-preact/package.json b/packages/wouter-preact/package.json
index 147c5a7..94936d4 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",
@@ -73,4 +74,4 @@
   "devDependencies": {
     "wouter": "*"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/wouter/package.json b/packages/wouter/package.json
index bd8512c..9ab98a8 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",
@@ -71,4 +72,4 @@
     "regexparam": "^3.0.0",
     "use-sync-external-store": "^1.0.0"
   }
-}
+}
\ No newline at end of file