diff --git a/bin/git-bug b/bin/git-bug
index e6c263f..3738654 100755
--- a/bin/git-bug
+++ b/bin/git-bug
@@ -6,7 +6,7 @@ if test "$1" = "finish"; then
   git merge --no-ff $branch && git delete-branch $branch
 else
   test -z $1 && echo "bug <name> required." 1>&2 && exit 1
-  if test -n $2; then
+  if test -n "$2"; then
     echo "too many arguments; if not finishing a bug, only <name> of new bug is expected" && exit 1
   fi
   branch=bug/$1
diff --git a/bin/git-feature b/bin/git-feature
index b2a9129..4a1eed0 100755
--- a/bin/git-feature
+++ b/bin/git-feature
@@ -6,7 +6,7 @@ if test "$1" = "finish"; then
   git merge --no-ff $branch && git delete-branch $branch
 else
   test -z $1 && echo "feature <name> required." 1>&2 && exit 1
-  if test -n $2; then
+  if test -n "$2"; then
     echo "too many arguments; if not finishing a feature, only <name> of new feature is expected" && exit 1
   fi
   branch=feature/$1
diff --git a/bin/git-refactor b/bin/git-refactor
index caffb7f..1130956 100755
--- a/bin/git-refactor
+++ b/bin/git-refactor
@@ -7,7 +7,7 @@ if test "$1" = "finish"; then
   git merge --no-ff $branch && git delete-branch $branch
 else
   test -z $1 && echo "refactor <name> required." 1>&2 && exit 1
-  if test -n $2; then
+  if test -n "$2"; then
     echo "too many arguments; if not finishing a refactor, only <name> of new refactoring is expected" && exit 1
   fi
   branch=refactor/$1