diff --git a/cmd/kubeadm/app/cmd/completion.go b/cmd/kubeadm/app/cmd/completion.go
index bca5a3649a1..940e542a2e9 100644
--- a/cmd/kubeadm/app/cmd/completion.go
+++ b/cmd/kubeadm/app/cmd/completion.go
@@ -260,7 +260,7 @@ autoload -U +X bashcompinit && bashcompinit
 # use word boundary patterns for BSD or GNU sed
 LWORD='[[:<:]]'
 RWORD='[[:>:]]'
-if sed --help 2>&1 | grep -q GNU; then
+if sed --version 2>&1 | grep -q GNU; then
 	LWORD='\<'
 	RWORD='\>'
 fi
diff --git a/staging/src/k8s.io/kubectl/pkg/cmd/completion/completion.go b/staging/src/k8s.io/kubectl/pkg/cmd/completion/completion.go
index 6b357cd5110..3b099ac83aa 100644
--- a/staging/src/k8s.io/kubectl/pkg/cmd/completion/completion.go
+++ b/staging/src/k8s.io/kubectl/pkg/cmd/completion/completion.go
@@ -233,7 +233,7 @@ autoload -U +X bashcompinit && bashcompinit
 # use word boundary patterns for BSD or GNU sed
 LWORD='[[:<:]]'
 RWORD='[[:>:]]'
-if sed --help 2>&1 | grep -q 'GNU\|BusyBox'; then
+if sed --version 2>&1 | grep -q GNU; then
 	LWORD='\<'
 	RWORD='\>'
 fi