diff --git a/etc/network.subr b/etc/network.subr
index 75ee8cad1ddb..72c72979c5c8 100644
--- a/etc/network.subr
+++ b/etc/network.subr
@@ -580,7 +580,7 @@ network_pass3() {
 
 	case ${pppoed_enable} in
 	[Yy][Ee][Ss])
-		if [ -n "$pppoed_provider ]; then
+		if [ -n "${pppoed_provider}" ]; then
 			pppoed_flags="${pppoed_flags} -p ${pppoed_provider}"
 		fi
 		echo -n ' pppoed';
diff --git a/etc/rc.d/netoptions b/etc/rc.d/netoptions
index 75ee8cad1ddb..72c72979c5c8 100644
--- a/etc/rc.d/netoptions
+++ b/etc/rc.d/netoptions
@@ -580,7 +580,7 @@ network_pass3() {
 
 	case ${pppoed_enable} in
 	[Yy][Ee][Ss])
-		if [ -n "$pppoed_provider ]; then
+		if [ -n "${pppoed_provider}" ]; then
 			pppoed_flags="${pppoed_flags} -p ${pppoed_provider}"
 		fi
 		echo -n ' pppoed';
diff --git a/etc/rc.d/network1 b/etc/rc.d/network1
index 75ee8cad1ddb..72c72979c5c8 100644
--- a/etc/rc.d/network1
+++ b/etc/rc.d/network1
@@ -580,7 +580,7 @@ network_pass3() {
 
 	case ${pppoed_enable} in
 	[Yy][Ee][Ss])
-		if [ -n "$pppoed_provider ]; then
+		if [ -n "${pppoed_provider}" ]; then
 			pppoed_flags="${pppoed_flags} -p ${pppoed_provider}"
 		fi
 		echo -n ' pppoed';
diff --git a/etc/rc.d/network2 b/etc/rc.d/network2
index 75ee8cad1ddb..72c72979c5c8 100644
--- a/etc/rc.d/network2
+++ b/etc/rc.d/network2
@@ -580,7 +580,7 @@ network_pass3() {
 
 	case ${pppoed_enable} in
 	[Yy][Ee][Ss])
-		if [ -n "$pppoed_provider ]; then
+		if [ -n "${pppoed_provider}" ]; then
 			pppoed_flags="${pppoed_flags} -p ${pppoed_provider}"
 		fi
 		echo -n ' pppoed';
diff --git a/etc/rc.d/network3 b/etc/rc.d/network3
index 75ee8cad1ddb..72c72979c5c8 100644
--- a/etc/rc.d/network3
+++ b/etc/rc.d/network3
@@ -580,7 +580,7 @@ network_pass3() {
 
 	case ${pppoed_enable} in
 	[Yy][Ee][Ss])
-		if [ -n "$pppoed_provider ]; then
+		if [ -n "${pppoed_provider}" ]; then
 			pppoed_flags="${pppoed_flags} -p ${pppoed_provider}"
 		fi
 		echo -n ' pppoed';
diff --git a/etc/rc.d/routing b/etc/rc.d/routing
index 75ee8cad1ddb..72c72979c5c8 100644
--- a/etc/rc.d/routing
+++ b/etc/rc.d/routing
@@ -580,7 +580,7 @@ network_pass3() {
 
 	case ${pppoed_enable} in
 	[Yy][Ee][Ss])
-		if [ -n "$pppoed_provider ]; then
+		if [ -n "${pppoed_provider}" ]; then
 			pppoed_flags="${pppoed_flags} -p ${pppoed_provider}"
 		fi
 		echo -n ' pppoed';
diff --git a/etc/rc.network b/etc/rc.network
index 75ee8cad1ddb..72c72979c5c8 100644
--- a/etc/rc.network
+++ b/etc/rc.network
@@ -580,7 +580,7 @@ network_pass3() {
 
 	case ${pppoed_enable} in
 	[Yy][Ee][Ss])
-		if [ -n "$pppoed_provider ]; then
+		if [ -n "${pppoed_provider}" ]; then
 			pppoed_flags="${pppoed_flags} -p ${pppoed_provider}"
 		fi
 		echo -n ' pppoed';