diff --git a/tools/install.sh b/tools/install.sh
index 5633320a8..542bf97c2 100755
--- a/tools/install.sh
+++ b/tools/install.sh
@@ -2,9 +2,8 @@ set -e
 
 # Use colors, but only if connected to a terminal, and that terminal
 # supports them.
-tput=$(which tput)
-if [ -n "$tput" ]; then
-    ncolors=$($tput colors)
+if which tput >/dev/null 2>&1; then
+    ncolors=$(tput colors)
 fi
 if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
   RED="$(tput setaf 1)"
diff --git a/tools/upgrade.sh b/tools/upgrade.sh
index 6e9696202..fe8fbadca 100644
--- a/tools/upgrade.sh
+++ b/tools/upgrade.sh
@@ -1,8 +1,7 @@
 
 # Use colors, but only if connected to a terminal, and that terminal
 # supports them.
-tput=$(which tput)
-if [ -n "$tput" ]; then
+if which tput >/dev/null 2>&1; then
     ncolors=$(tput colors)
 fi
 if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then