diff --git a/.changeset/twelve-eggs-join.md b/.changeset/twelve-eggs-join.md
new file mode 100644
index 0000000000..d1df23f5f6
--- /dev/null
+++ b/.changeset/twelve-eggs-join.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fix issue when process.env.LANG was longer than 5 characters
diff --git a/packages/astro/src/core/logger.ts b/packages/astro/src/core/logger.ts
index 4aaa5a6484..195094ba39 100644
--- a/packages/astro/src/core/logger.ts
+++ b/packages/astro/src/core/logger.ts
@@ -18,7 +18,7 @@ function getLoggerLocale(): string {
 		// Check if language code is atleast two characters long (ie. en, es).
 		// NOTE: if "c" locale is encountered, the default locale will be returned.
 		if (extractedLocale.length < 2) return defaultLocale;
-		else return extractedLocale;
+		else return extractedLocale.substring(0, 5);
 	} else return defaultLocale;
 }