diff --git a/openbr/core/common.cpp b/openbr/core/common.cpp
index 17584ec..55cbd3e 100644
--- a/openbr/core/common.cpp
+++ b/openbr/core/common.cpp
@@ -15,11 +15,15 @@
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #include "common.h"
+#include <QMutex>
 
 using namespace std;
 
 /**** GLOBAL ****/
 void Common::seedRNG() {
+    static QMutex seedControl;
+    QMutexLocker lock(&seedControl);
+
     static bool seeded = false;
     if (!seeded) {
         srand(0); // We seed with 0 instead of time(NULL) to have reproducible randomness
@@ -29,8 +33,6 @@ void Common::seedRNG() {
 
 QList<int> Common::RandSample(int n, int max, int min, bool unique)
 {
-    seedRNG();
-
     QList<int> samples; samples.reserve(n);
     int range = max-min;
     if (range <= 0) qFatal("Non-positive range.");
@@ -50,8 +52,6 @@ QList<int> Common::RandSample(int n, int max, int min, bool unique)
 
 QList<int> Common::RandSample(int n, const QSet<int> &values, bool unique)
 {
-    seedRNG();
-
     QList<int> valueList = values.toList();
     if (unique && (values.size() <= n)) return valueList;
 
diff --git a/openbr/openbr_plugin.cpp b/openbr/openbr_plugin.cpp
index d681843..5f2a855 100644
--- a/openbr/openbr_plugin.cpp
+++ b/openbr/openbr_plugin.cpp
@@ -891,6 +891,8 @@ void br::Context::initialize(int &argc, char *argv[], QString sdkPath, bool use_
 
     qInstallMessageHandler(messageHandler);
 
+    Common::seedRNG();
+
     // Search for SDK
     if (sdkPath.isEmpty()) {
         QStringList checkPaths; checkPaths << QDir::currentPath() << QCoreApplication::applicationDirPath();
diff --git a/openbr/plugins/independent.cpp b/openbr/plugins/independent.cpp
index fd650dc..3886e8c 100644
--- a/openbr/plugins/independent.cpp
+++ b/openbr/plugins/independent.cpp
@@ -35,7 +35,6 @@ static TemplateList Downsample(const TemplateList &templates, int classes, int i
     if ((classes != std::numeric_limits<int>::max()) && (uniqueLabels.size() < classes))
         qWarning("Downsample requested %d classes but only %d are available.", classes, uniqueLabels.size());
 
-    Common::seedRNG();
     QList<QString> selectedLabels = uniqueLabels;
     if (classes < uniqueLabels.size()) {
         std::random_shuffle(selectedLabels.begin(), selectedLabels.end());