diff --git a/haskell/.devcontainer/Dockerfile b/haskell/.devcontainer/Dockerfile
index 5f23c99..5e88858 100644
--- a/haskell/.devcontainer/Dockerfile
+++ b/haskell/.devcontainer/Dockerfile
@@ -42,5 +42,7 @@ RUN cabal update && cabal install --lib HUnit \
 
 # workaround for aarch64 architecture to compile HLS
 RUN if [ "$(uname -m)" = "aarch64" ]; then \
-        cabal update && ghcup compile hls --version 2.14.0.0 --ghc 9.10.3 && rm -rf ~/.cabal/packages/*; \
+        export LANG=C.UTF-8 && export LC_ALL=C.UTF-8 \
+        && cabal update && ghcup compile hls --version 2.14.0.0 --ghc 9.10.3 \
+        && rm -rf ~/.cabal/packages/*; \
     fi