diff --git a/.changeset/tame-cherries-invite.md b/.changeset/tame-cherries-invite.md
new file mode 100644
index 0000000000..6f61e23e2e
--- /dev/null
+++ b/.changeset/tame-cherries-invite.md
@@ -0,0 +1,5 @@
+---
+'@ice/webpack-config': patch
+---
+
+fix: make sure ssr / ssg env variable is always false in csr
diff --git a/packages/webpack-config/src/index.ts b/packages/webpack-config/src/index.ts
index 1ee084027e..473d7e2077 100644
--- a/packages/webpack-config/src/index.ts
+++ b/packages/webpack-config/src/index.ts
@@ -102,6 +102,9 @@ function getDefineVars(
   return {
     ...define,
     ...runtimeDefineVars,
+    // Make sure ICE_CORE_SSR and ICE_CORE_SSG is always false in csr mode.
+    'process.env.ICE_CORE_SSR': 'false',
+    'process.env.ICE_CORE_SSG': 'false',
   };
 }