diff --git a/install.sh b/install.sh
index 270c1156..85ca0079 100755
--- a/install.sh
+++ b/install.sh
@@ -24,7 +24,7 @@
 
 __version() {
 # Grab version from __metadata_.py file
-cat setup.cfg | grep "version =" | tr -d [[:space:]] | cut -c9-13 | tr , .
+cat setup.cfg | grep "version =" | tr -d "[:space:]" | cut -c9-13 | tr , .
 }
 
 PRGNAM=slpkg
diff --git a/slackbuild/slpkg.SlackBuild b/slackbuild/slpkg.SlackBuild
index d5ce5569..b0d43695 100755
--- a/slackbuild/slpkg.SlackBuild
+++ b/slackbuild/slpkg.SlackBuild
@@ -24,7 +24,7 @@
 
 __version() {
 # Grab version from __metadata_.py file
-cat ../setup.cfg | grep "version =" | tr -d [[:space:]] | cut -c9-13 | tr , .
+cat ../setup.cfg | grep "version =" | tr -d "[:space:]" | cut -c9-13 | tr , .
 }
 
 cd $(dirname $0) ; CWD=$(pwd)