diff --git a/bin/pt-stalk b/bin/pt-stalk
index b742d071..404187ed 100755
--- a/bin/pt-stalk
+++ b/bin/pt-stalk
@@ -301,7 +301,7 @@ _parse_command_line() {
 
          real_opt="$opt"
 
-         if $(echo $opt | grep -q '^--no-'); then
+         if $(echo $opt | grep '^--no-' >/dev/null); then
             opt_is_negated=1
             opt=$(echo $opt | sed 's/^--no-//')
          else
diff --git a/lib/bash/parse_options.sh b/lib/bash/parse_options.sh
index 9a71034a..23443bb4 100644
--- a/lib/bash/parse_options.sh
+++ b/lib/bash/parse_options.sh
@@ -370,7 +370,7 @@ _parse_command_line() {
          real_opt="$opt"
 
          # Strip leading -- or --no- from option.
-         if $(echo $opt | grep -q '^--no-'); then
+         if $(echo $opt | grep '^--no-' >/dev/null); then
             opt_is_negated=1
             opt=$(echo $opt | sed 's/^--no-//')
          else