diff --git a/test/array.cpp b/test/array.cpp
index 631a29432..330749e1d 100644
--- a/test/array.cpp
+++ b/test/array.cpp
@@ -152,6 +152,7 @@ template<typename ArrayType> void comparisons(const ArrayType& m)
 template<typename ArrayType> void array_real(const ArrayType& m)
 {
   using std::abs;
+  using std::sqrt;
   typedef typename ArrayType::Index Index;
   typedef typename ArrayType::Scalar Scalar;
   typedef typename NumTraits<Scalar>::Real RealScalar;
diff --git a/test/geo_quaternion.cpp b/test/geo_quaternion.cpp
index 06b3af7c1..27040dd4d 100644
--- a/test/geo_quaternion.cpp
+++ b/test/geo_quaternion.cpp
@@ -31,7 +31,7 @@ template<typename QuatType> void check_slerp(const QuatType& q0, const QuatType&
 
   Scalar theta_tot = AA(q1*q0.inverse()).angle();
   if(theta_tot>M_PI)
-    theta_tot = 2.*M_PI-theta_tot;
+    theta_tot = Scalar(2.*M_PI)-theta_tot;
   for(Scalar t=0; t<=1.001; t+=0.1)
   {
     QuatType q = q0.slerp(t,q1);
diff --git a/test/jacobi.cpp b/test/jacobi.cpp
index 0e6f1de49..7ccd4124b 100644
--- a/test/jacobi.cpp
+++ b/test/jacobi.cpp
@@ -74,7 +74,8 @@ void test_jacobi()
     // complex<float> is really important to test as it is the only way to cover conjugation issues in certain unaligned paths
     CALL_SUBTEST_6(( jacobi<MatrixXcf, float>(MatrixXcf(r,c)) ));
     CALL_SUBTEST_6(( jacobi<MatrixXcf, std::complex<float> >(MatrixXcf(r,c)) ));
-    (void) r;
-    (void) c;
+    
+    TEST_SET_BUT_UNUSED_VARIABLE(r);
+    TEST_SET_BUT_UNUSED_VARIABLE(c);
   }
 }