diff --git a/scripts/fix-glyphmaps.sh b/scripts/fix-glyphmaps.sh
index 415e059d0..4aa28a6ed 100755
--- a/scripts/fix-glyphmaps.sh
+++ b/scripts/fix-glyphmaps.sh
@@ -4,7 +4,7 @@
 
 set -e
 
-if [ "$OSTYPE" == "osx" ]; then
+if [ "$(uname)" == "Darwin" ]; then
   ISED='sed -i ""'
 else # $OSTYPE == linux64
   ISED='sed -i'