diff --git a/.changeset/legal-bags-agree.md b/.changeset/legal-bags-agree.md
new file mode 100644
index 00000000..ebc78f93
--- /dev/null
+++ b/.changeset/legal-bags-agree.md
@@ -0,0 +1,5 @@
+---
+"@opennextjs/cloudflare": patch
+---
+
+fix `deploy` and `upload` commands not taking into account environment variables
diff --git a/packages/cloudflare/src/cli/commands/skew-protection.ts b/packages/cloudflare/src/cli/commands/skew-protection.ts
index e6456848..acac2161 100644
--- a/packages/cloudflare/src/cli/commands/skew-protection.ts
+++ b/packages/cloudflare/src/cli/commands/skew-protection.ts
@@ -45,18 +45,23 @@ const MS_PER_DAY = 24 * 3600 * 1000;
  *
  * @param options Build options
  * @param config OpenNext config
- * @param envVars Environment variables
+ * @param workerEnvVars Worker Environment variables (taken from the wrangler config files)
  * @returns Deployment mapping or undefined
  */
 export async function getDeploymentMapping(
 	options: BuildOptions,
 	config: OpenNextConfig,
-	envVars: WorkerEnvVar
+	workerEnvVars: WorkerEnvVar
 ): Promise<Record<string, string> | undefined> {
 	if (config.cloudflare?.skewProtection?.enabled !== true) {
 		return undefined;
 	}
 
+	// Note that `process.env` is spread after `workerEnvVars` since we do want
+	// system environment variables to take precedence over the variables defined
+	// in the wrangler config files
+	const envVars = { ...workerEnvVars, ...process.env };
+
 	const nextConfig = loadConfig(path.join(options.appBuildOutputPath, ".next"));
 	const deploymentId = nextConfig.deploymentId;