diff --git a/llvm/utils/release/test-release.sh b/llvm/utils/release/test-release.sh
index 050004aa08c49..d7194d2d8e531 100755
--- a/llvm/utils/release/test-release.sh
+++ b/llvm/utils/release/test-release.sh
@@ -755,8 +755,8 @@ for Flavor in $Flavors ; do
             # case there are build paths in the debug info. Do the same sub-
             # stitution on both files in case the string occurrs naturally.
             if ! cmp -s \
-                <(env LC_CTYPE=C sed -e 's,Phase1,Phase2,g' -e 's,Phase2,Phase3,g' $p2) \
-                <(env LC_CTYPE=C sed -e 's,Phase1,Phase2,g' -e 's,Phase2,Phase3,g' $p3) \
+                <(env LC_ALL=C sed -e 's,Phase1,Phase2,g' -e 's,Phase2,Phase3,g' $p2) \
+                <(env LC_ALL=C sed -e 's,Phase1,Phase2,g' -e 's,Phase2,Phase3,g' $p3) \
                 16 16; then
                 echo "file `basename $p2` differs between phase 2 and phase 3"
             fi