diff --git a/src/Common/gui/MainWindow.cpp b/src/Common/gui/MainWindow.cpp
index 34c026eff..b91a7605c 100755
--- a/src/Common/gui/MainWindow.cpp
+++ b/src/Common/gui/MainWindow.cpp
@@ -153,7 +153,7 @@ void MainWindow::setupMainTabCornerWidgets()
     performanceMonitorLabel->setObjectName(QStringLiteral("labelPerformanceMonitor"));
 
 #ifndef Q_OS_WIN
-   performanceMonitorLabel->setVisible(false); // showing RAM monitor in windows only
+    performanceMonitorLabel->setVisible(false); // showing RAM monitor in windows only
 #endif
 
     transmitTransferRateLabel = new QLabel(this);
@@ -2094,7 +2094,7 @@ void MainWindow::timerEvent(QTimerEvent *)
             ninjamWindow->updatePeaks();
     }
 
-    // update cpu and memmory usage
+    // update cpu and RAM usage
     qint64 now = QDateTime::currentMSecsSinceEpoch();
     if (now - lastPerformanceMonitorUpdate >= PERFORMANCE_MONITOR_REFRESH_TIME) {
 
@@ -2103,7 +2103,7 @@ void MainWindow::timerEvent(QTimerEvent *)
                    auto memmoryUsed = performanceMonitor->getMemmoryUsed();
                    auto batteryUsed = performanceMonitor->getBatteryUsed();
 
-                   bool showMemmory = memmoryUsed > 60; //memory meter only active if memory usage is <60%
+                   bool showMemmory = memmoryUsed > 60; //memory meter only active (as an alert) if RAM usage is > 60%
                    bool showBattery = batteryUsed < 255; //Battery meter active only if battery is available
 
                    QString string;
diff --git a/src/Common/performance/LinuxPerformanceMonitor.cpp b/src/Common/performance/LinuxPerformanceMonitor.cpp
index 9086a38f2..ae7d480a7 100644
--- a/src/Common/performance/LinuxPerformanceMonitor.cpp
+++ b/src/Common/performance/LinuxPerformanceMonitor.cpp
@@ -1,5 +1,6 @@
 #include "PerformanceMonitor.h"
 
+#include "sys/sysinfo.h"
 
 PerformanceMonitor::PerformanceMonitor(){
 
@@ -10,8 +11,10 @@ PerformanceMonitor::~PerformanceMonitor(){
 }
 
 int PerformanceMonitor::getMemmoryUsed(){
-
-    return 0;
+    struct sysinfo memInfo;
+    sysinfo (&memInfo);
+    long long virtualMemUsed = memInfo.totalram - memInfo.freeram ;
+    return 100 * virtualMemUsed / memInfo.totalram;
 }
 
 int PerformanceMonitor::getBatteryUsed()
diff --git a/src/Common/performance/WindowsPerformanceMonitor.cpp b/src/Common/performance/WindowsPerformanceMonitor.cpp
index b170d0375..720a2fe34 100644
--- a/src/Common/performance/WindowsPerformanceMonitor.cpp
+++ b/src/Common/performance/WindowsPerformanceMonitor.cpp
@@ -17,7 +17,7 @@ PerformanceMonitor::~PerformanceMonitor()
 int PerformanceMonitor::getMemmoryUsed()
 {
 
-    //http://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process
+    //https://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process
     MEMORYSTATUSEX memInfo;
     memInfo.dwLength = sizeof(MEMORYSTATUSEX);
     bool result = GlobalMemoryStatusEx(&memInfo);