diff --git a/themes/build-themes.sh b/themes/build-themes.sh
index 08b23419..40764c53 100755
--- a/themes/build-themes.sh
+++ b/themes/build-themes.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-FILE_PATH="`dirname \"$0\"`"
+FILE_PATH="$(dirname \"$0\")"
 
-for file in `ls "${FILE_PATH}/"*.less`; do
+for file in $(ls "${FILE_PATH}/"*.less); do
     filename="${file##*/}"
     themeName="${filename%.less}"