diff --git a/examples/exRootFinder.cpp b/examples/exRootFinder.cpp
index 0ff1133..181352a 100644
--- a/examples/exRootFinder.cpp
+++ b/examples/exRootFinder.cpp
@@ -7,8 +7,8 @@ using namespace Latan;
 int main(void)
 {
     constexpr double a = 1., b = 10.;
-    DoubleFunction f1([a](const double *x){return a*(1.-x[0]);}, 2);
-    DoubleFunction f2([b](const double *x){return b*(x[1]-x[0]*x[0]);}, 2);
+    DoubleFunction f1([](const double *x){return a*(1.-x[0]);}, 2);
+    DoubleFunction f2([](const double *x){return b*(x[1]-x[0]*x[0]);}, 2);
     vector<DoubleFunction *> system = {&f1, &f2};
     GslHybridRootFinder solve;
     DVec init(2), x;
diff --git a/lib/MatSample.hpp b/lib/MatSample.hpp
index 5973b31..0678cca 100644
--- a/lib/MatSample.hpp
+++ b/lib/MatSample.hpp
@@ -228,7 +228,7 @@ Index MatSample<T>::BlockTemplate<S>::getNCol(void) const
 // assignement operators ///////////////////////////////////////////////////////
 template <typename T>
 template <class S>
-MatSample<T>::BlockTemplate<S> &
+typename MatSample<T>::template BlockTemplate<S> &
 MatSample<T>::BlockTemplate<S>::operator=(const S &sample)
 {
     FOR_STAT_ARRAY(sample_, s)
@@ -241,7 +241,7 @@ MatSample<T>::BlockTemplate<S>::operator=(const S &sample)
 
 template <typename T>
 template <class S>
-MatSample<T>::BlockTemplate<S> &
+typename MatSample<T>::template BlockTemplate<S> &
 MatSample<T>::BlockTemplate<S>::operator=(const S &&sample)
 {
     *this = sample;