diff --git a/Eigen/src/Eigen2Support/Geometry/AlignedBox.h b/Eigen/src/Eigen2Support/Geometry/AlignedBox.h
index 7b2b865eb..2e4309dd9 100644
--- a/Eigen/src/Eigen2Support/Geometry/AlignedBox.h
+++ b/Eigen/src/Eigen2Support/Geometry/AlignedBox.h
@@ -34,7 +34,7 @@ EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF_VECTORIZABLE_FIXED_SIZE(_Scalar,_AmbientDim==
   typedef Matrix<Scalar,AmbientDimAtCompileTime,1> VectorType;
 
   /** Default constructor initializing a null box. */
-  inline explicit AlignedBox()
+  inline AlignedBox()
   { if (AmbientDimAtCompileTime!=Dynamic) setNull(); }
 
   /** Constructs a null box with \a _dim the dimension of the ambient space. */
diff --git a/Eigen/src/Eigen2Support/Geometry/Hyperplane.h b/Eigen/src/Eigen2Support/Geometry/Hyperplane.h
index 49e37392d..b95bf00ec 100644
--- a/Eigen/src/Eigen2Support/Geometry/Hyperplane.h
+++ b/Eigen/src/Eigen2Support/Geometry/Hyperplane.h
@@ -44,7 +44,7 @@ public:
   typedef Block<Coefficients,AmbientDimAtCompileTime,1> NormalReturnType;
 
   /** Default constructor without initialization */
-  inline explicit Hyperplane() {}
+  inline Hyperplane() {}
 
   /** Constructs a dynamic-size hyperplane with \a _dim the dimension
     * of the ambient space */
diff --git a/Eigen/src/Eigen2Support/Geometry/ParametrizedLine.h b/Eigen/src/Eigen2Support/Geometry/ParametrizedLine.h
index 3523611ee..9b57b7e0b 100644
--- a/Eigen/src/Eigen2Support/Geometry/ParametrizedLine.h
+++ b/Eigen/src/Eigen2Support/Geometry/ParametrizedLine.h
@@ -36,7 +36,7 @@ public:
   typedef Matrix<Scalar,AmbientDimAtCompileTime,1> VectorType;
 
   /** Default constructor without initialization */
-  inline explicit ParametrizedLine() {}
+  inline ParametrizedLine() {}
 
   /** Constructs a dynamic-size line with \a _dim the dimension
     * of the ambient space */
diff --git a/Eigen/src/Geometry/EulerAngles.h b/Eigen/src/Geometry/EulerAngles.h
index 28135a954..97984d590 100644
--- a/Eigen/src/Geometry/EulerAngles.h
+++ b/Eigen/src/Geometry/EulerAngles.h
@@ -44,7 +44,6 @@ MatrixBase<Derived>::eulerAngles(Index a0, Index a1, Index a2) const
 
   Matrix<Scalar,3,1> res;
   typedef Matrix<typename Derived::Scalar,2,1> Vector2;
-  const Scalar epsilon = NumTraits<Scalar>::dummy_precision();
 
   const Index odd = ((a0+1)%3 == a1) ? 0 : 1;
   const Index i = a0;
diff --git a/unsupported/test/kronecker_product.cpp b/unsupported/test/kronecker_product.cpp
index 108bf6fde..8ddc6ec28 100644
--- a/unsupported/test/kronecker_product.cpp
+++ b/unsupported/test/kronecker_product.cpp
@@ -112,8 +112,8 @@ void test_kronecker_product()
 
   CALL_SUBTEST(check_kronecker_product(DM_fix_ab));
 
-  for(unsigned int i=0;i<DM_fix_ab.rows();++i)
-    for(unsigned int j=0;j<DM_fix_ab.cols();++j)
+  for(int i=0;i<DM_fix_ab.rows();++i)
+    for(int j=0;j<DM_fix_ab.cols();++j)
        VERIFY_IS_APPROX(kroneckerProduct(DM_a,DM_b).coeff(i,j), DM_fix_ab(i,j));
 
   // test kroneckerProduct(DM,DM,DM_block)