diff --git a/tools/ci-build.sh b/tools/ci-build.sh
index b95cfa86..ea6b35a2 100755
--- a/tools/ci-build.sh
+++ b/tools/ci-build.sh
@@ -29,6 +29,12 @@ set -x
 
 NULL=
 
+if [ "$(uname -s || true)" = Linux ]; then
+    export LANG=C.UTF-8
+    export LANGUAGE=C.UTF-8
+    export LC_ALL=C.UTF-8
+fi
+
 ##
 ## initialize support to run cross compiled executables
 ##