diff --git a/gdb/gdb_mbuild.sh b/gdb/gdb_mbuild.sh
index 44def191dc8..705bb1f6f1f 100755
--- a/gdb/gdb_mbuild.sh
+++ b/gdb/gdb_mbuild.sh
@@ -22,8 +22,8 @@
 
 # Make certain that the script is not running in an internationalized
 # environment.
-LANG=c ; export LANG
-LC_ALL=c ; export LC_ALL
+LANG=C ; export LANG
+LC_ALL=C ; export LC_ALL
 
 usage()
 {