diff --git a/kotlin/internal/jvm/compile.bzl b/kotlin/internal/jvm/compile.bzl
index dc08928..74e3ad6 100644
--- a/kotlin/internal/jvm/compile.bzl
+++ b/kotlin/internal/jvm/compile.bzl
@@ -231,6 +231,9 @@
         arguments = [args],
         progress_message = progress_message,
         input_manifests = input_manifests,
+        env = {
+            "LC_CTYPE": "en_US.UTF-8" # For Java source files
+        },
     )
 
     return struct(