diff --git a/hardware/LEDborg/78-ledborg.js b/hardware/LEDborg/78-ledborg.js
index 5dfdabd7..8166f3a4 100644
--- a/hardware/LEDborg/78-ledborg.js
+++ b/hardware/LEDborg/78-ledborg.js
@@ -12,7 +12,7 @@ module.exports = function(RED) {
 
     try {
         var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
-        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi")) {
+        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi") === -1) {
             RED.log.warn("ledborg : "+RED._("node-red:rpi-gpio.errors.ignorenode"));
             allOK = false;
         }
diff --git a/hardware/PiLcd/pilcd.js b/hardware/PiLcd/pilcd.js
index 6f783aa9..857e72d9 100644
--- a/hardware/PiLcd/pilcd.js
+++ b/hardware/PiLcd/pilcd.js
@@ -10,7 +10,7 @@ module.exports = function(RED) {
 
     try {
         var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
-        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi")) {
+        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi") === -1) {
             RED.log.warn("rpi-lcd : "+RED._("pilcd.errors.ignorenode"));
             allOK = false;
         }
diff --git a/hardware/PiSrf/pisrf.js b/hardware/PiSrf/pisrf.js
index ded0384f..cc293cac 100644
--- a/hardware/PiSrf/pisrf.js
+++ b/hardware/PiSrf/pisrf.js
@@ -10,7 +10,7 @@ module.exports = function(RED) {
 
     try {
         var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
-        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi")) {
+        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi") === -1) {
             RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.ignorenode"));
             allOK = false;
         }
diff --git a/hardware/mcp3008/pimcp3008.js b/hardware/mcp3008/pimcp3008.js
index 720b5fae..23db7f39 100644
--- a/hardware/mcp3008/pimcp3008.js
+++ b/hardware/mcp3008/pimcp3008.js
@@ -7,7 +7,7 @@ module.exports = function(RED) {
     // unlikely if not on a Pi
     try {
         var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
-        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi")) {
+        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi") === -1) {
             RED.log.warn("Info : mcp3xxx : Not running on a Pi - Ignoring node");
         }
         else {
diff --git a/hardware/unicorn/unicorn.js b/hardware/unicorn/unicorn.js
index 9babc5f0..5161cf65 100644
--- a/hardware/unicorn/unicorn.js
+++ b/hardware/unicorn/unicorn.js
@@ -11,7 +11,7 @@ module.exports = function(RED) {
 
     try {
         var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
-        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi")) {
+        if (cpuinfo.indexOf(": BCM") === -1 && cpuinfo.indexOf(": Raspberry Pi") === -1) {
             RED.log.warn("rpi-unicorn : "+RED._("node-red:rpi-gpio.errors.ignorenode"));
             allOK = false;
         }