diff --git a/Eigen/src/QR/ColPivHouseholderQR.h b/Eigen/src/QR/ColPivHouseholderQR.h
index 8a7c9b9e2..8b01f8179 100644
--- a/Eigen/src/QR/ColPivHouseholderQR.h
+++ b/Eigen/src/QR/ColPivHouseholderQR.h
@@ -525,8 +525,8 @@ struct solve_retval<ColPivHouseholderQR<_MatrixType>, Rhs>
   {
     eigen_assert(rhs().rows() == dec().rows());
 
-    const int cols = dec().cols(),
-    nonzero_pivots = dec().nonzeroPivots();
+    const Index cols = dec().cols(),
+				nonzero_pivots = dec().nonzeroPivots();
 
     if(nonzero_pivots == 0)
     {
diff --git a/Eigen/src/SparseLU/SparseLU_pruneL.h b/Eigen/src/SparseLU/SparseLU_pruneL.h
index 5a855f82f..66460d168 100644
--- a/Eigen/src/SparseLU/SparseLU_pruneL.h
+++ b/Eigen/src/SparseLU/SparseLU_pruneL.h
@@ -56,7 +56,7 @@ void SparseLUImpl<Scalar,Index>::pruneL(const Index jcol, const IndexVector& per
   Index jsupno = glu.supno(jcol); 
   Index i,irep,irep1; 
   bool movnum, do_prune = false; 
-  Index kmin, kmax, minloc, maxloc,krow; 
+  Index kmin = 0, kmax = 0, minloc, maxloc,krow; 
   for (i = 0; i < nseg; i++)
   {
     irep = segrep(i); 
diff --git a/test/geo_quaternion.cpp b/test/geo_quaternion.cpp
index e011879a5..1694b32c7 100644
--- a/test/geo_quaternion.cpp
+++ b/test/geo_quaternion.cpp
@@ -32,7 +32,7 @@ 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 = Scalar(2.*M_PI)-theta_tot;
-  for(Scalar t=0; t<=1.001; t+=0.1)
+  for(Scalar t=0; t<=Scalar(1.001); t+=Scalar(0.1))
   {
     QuatType q = q0.slerp(t,q1);
     Scalar theta = AA(q*q0.inverse()).angle();
@@ -156,7 +156,7 @@ template<typename Scalar, int Options> void quaternion(void)
   check_slerp(q1,q2);
 
   q1 = AngleAxisx(b, v1.normalized());
-  q2 = AngleAxisx(b+M_PI, v1.normalized());
+  q2 = AngleAxisx(b+Scalar(M_PI), v1.normalized());
   check_slerp(q1,q2);
 
   q1 = AngleAxisx(b,  v1.normalized());
diff --git a/test/sizeof.cpp b/test/sizeof.cpp
index c454780a6..d9ad35620 100644
--- a/test/sizeof.cpp
+++ b/test/sizeof.cpp
@@ -13,7 +13,7 @@ template<typename MatrixType> void verifySizeOf(const MatrixType&)
 {
   typedef typename MatrixType::Scalar Scalar;
   if (MatrixType::RowsAtCompileTime!=Dynamic && MatrixType::ColsAtCompileTime!=Dynamic)
-    VERIFY(sizeof(MatrixType)==sizeof(Scalar)*std::ptrdiff_t(MatrixType::SizeAtCompileTime));
+    VERIFY(std::ptrdiff_t(sizeof(MatrixType))==std::ptrdiff_t(sizeof(Scalar))*std::ptrdiff_t(MatrixType::SizeAtCompileTime));
   else
     VERIFY(sizeof(MatrixType)==sizeof(Scalar*) + 2 * sizeof(typename MatrixType::Index));
 }
diff --git a/test/sparse.h b/test/sparse.h
index 1a5ceb38d..a09c65e5f 100644
--- a/test/sparse.h
+++ b/test/sparse.h
@@ -66,10 +66,10 @@ initSparse(double density,
   //sparseMat.reserve(int(refMat.rows()*refMat.cols()*density));
   sparseMat.reserve(VectorXi::Constant(IsRowMajor ? refMat.rows() : refMat.cols(), int((1.5*density)*(IsRowMajor?refMat.cols():refMat.rows()))));
   
-  for(int j=0; j<sparseMat.outerSize(); j++)
+  for(Index j=0; j<sparseMat.outerSize(); j++)
   {
     //sparseMat.startVec(j);
-    for(int i=0; i<sparseMat.innerSize(); i++)
+    for(Index i=0; i<sparseMat.innerSize(); i++)
     {
       int ai(i), aj(j);
       if(IsRowMajor)
diff --git a/test/sparse_basic.cpp b/test/sparse_basic.cpp
index d466b51da..498ecfe29 100644
--- a/test/sparse_basic.cpp
+++ b/test/sparse_basic.cpp
@@ -449,12 +449,12 @@ template<typename SparseMatrixType> void sparse_basic(const SparseMatrixType& re
   
   // test conservative resize
   {
-      std::vector< std::pair<int,int> > inc;
-      inc.push_back(std::pair<int,int>(-3,-2));
-      inc.push_back(std::pair<int,int>(0,0));
-      inc.push_back(std::pair<int,int>(3,2));
-      inc.push_back(std::pair<int,int>(3,0));
-      inc.push_back(std::pair<int,int>(0,3));
+      std::vector< std::pair<Index,Index> > inc;
+      inc.push_back(std::pair<Index,Index>(-3,-2));
+      inc.push_back(std::pair<Index,Index>(0,0));
+      inc.push_back(std::pair<Index,Index>(3,2));
+      inc.push_back(std::pair<Index,Index>(3,0));
+      inc.push_back(std::pair<Index,Index>(0,3));
       
       for(size_t i = 0; i< inc.size(); i++) {
         Index incRows = inc[i].first;
@@ -472,9 +472,9 @@ template<typename SparseMatrixType> void sparse_basic(const SparseMatrixType& re
         
         // Insert new values
         if (incRows > 0) 
-          m1.insert(refMat1.rows()-1, 0) = refMat1(refMat1.rows()-1, 0) = 1;
+          m1.insert(m1.rows()-1, 0) = refMat1(refMat1.rows()-1, 0) = 1;
         if (incCols > 0) 
-          m1.insert(0, refMat1.cols()-1) = refMat1(0, refMat1.cols()-1) = 1;
+          m1.insert(0, m1.cols()-1) = refMat1(0, refMat1.cols()-1) = 1;
           
         VERIFY_IS_APPROX(m1, refMat1);