diff --git a/openbr/openbr_plugin.cpp b/openbr/openbr_plugin.cpp
index 214baa4..53192f5 100644
--- a/openbr/openbr_plugin.cpp
+++ b/openbr/openbr_plugin.cpp
@@ -529,7 +529,7 @@ QList<int> TemplateList::applyIndex(const QString &propName, const QHash<QString
     return result;
 }
 
-TemplateList TemplateList::partition(const QString &inputVariable, int bootStrap) const
+TemplateList TemplateList::partition(const QString &inputVariable, unsigned int bootStrap) const
 {
     TemplateList partitioned = *this;
     if (bootStrap > 0) {
diff --git a/openbr/openbr_plugin.h b/openbr/openbr_plugin.h
index a7424a2..74bc050 100644
--- a/openbr/openbr_plugin.h
+++ b/openbr/openbr_plugin.h
@@ -459,7 +459,7 @@ struct TemplateList : public QList<Template>
     BR_EXPORT static TemplateList relabel(const TemplateList &tl, const QString &propName, bool preserveIntegers);
 
     /*!< \brief Assign templates to folds partitions. */
-    BR_EXPORT TemplateList partition(const QString &inputVariable, int bootStrap = 0) const;
+    BR_EXPORT TemplateList partition(const QString &inputVariable, unsigned int bootStrap = 0) const;
 
     BR_EXPORT QList<int> indexProperty(const QString &propName, QHash<QString, int> * valueMap=NULL,QHash<int, QVariant> * reverseLookup = NULL) const;
     BR_EXPORT QList<int> indexProperty(const QString &propName, QHash<QString, int> &valueMap, QHash<int, QVariant> &reverseLookup) const;
diff --git a/openbr/plugins/core/crossvalidate.cpp b/openbr/plugins/core/crossvalidate.cpp
index e3a3f28..2603659 100644
--- a/openbr/plugins/core/crossvalidate.cpp
+++ b/openbr/plugins/core/crossvalidate.cpp
@@ -56,10 +56,10 @@ class CrossValidateTransform : public MetaTransform
     Q_OBJECT
     Q_PROPERTY(QString description READ get_description WRITE set_description RESET reset_description STORED false)
     Q_PROPERTY(QString inputVariable READ get_inputVariable WRITE set_inputVariable RESET reset_inputVariable STORED false)
-    Q_PROPERTY(int bootStrap READ get_bootStrap WRITE set_bootStrap RESET reset_bootStrap STORED false)
+    Q_PROPERTY(unsigned int bootStrap READ get_bootStrap WRITE set_bootStrap RESET reset_bootStrap STORED false)
     BR_PROPERTY(QString, description, "Identity")
     BR_PROPERTY(QString, inputVariable, "Label")
-    BR_PROPERTY(int, bootStrap, 0)
+    BR_PROPERTY(unsigned int, bootStrap, 0)
 
     // numPartitions copies of transform specified by description.
     QList<br::Transform*> transforms;
@@ -74,7 +74,7 @@ class CrossValidateTransform : public MetaTransform
         while (transforms.size() < numPartitions)
             transforms.append(make(description));
 
-        if (numPartitions < 2 && !(bootStrap > 0)) {
+        if (numPartitions < 2 && !bootStrap) {
             transforms.first()->train(data);
             return;
         }