diff --git a/sysinfo/version.sh b/sysinfo/version.sh
index 0b948bc..1c1467a 100755
--- a/sysinfo/version.sh
+++ b/sysinfo/version.sh
@@ -51,11 +51,11 @@ fi
 
 cd "$srcdir" || exit 2
 
-gitver=`git rev-parse --verify HEAD 2>/dev/null` || gitver="unknown"
-macro=`echo "$prefix"_GIT_VERSION | tr '[:lower:]' '[:upper:]'`
+gitver=$(git rev-parse --verify HEAD 2>/dev/null) || gitver="unknown"
+macro=$(echo "$prefix"_GIT_VERSION | tr '[:lower:]' '[:upper:]')
 
 cd "$workdir" || exit 2
-mkdir  -p `dirname "$output"` || exit 2
+mkdir  -p $(dirname "$output") || exit 2
 printf "#define $macro\t\"$gitver\"\n" > "$output"
 
 # all done