diff --git a/test/cholesky.cpp b/test/cholesky.cpp
index b0e0dd33c..a49625e90 100644
--- a/test/cholesky.cpp
+++ b/test/cholesky.cpp
@@ -139,6 +139,7 @@ void test_cholesky()
 {
   for(int i = 0; i < g_repeat; i++) {
     CALL_SUBTEST( cholesky(Matrix<double,1,1>()) );
+    CALL_SUBTEST( cholesky(MatrixXd(1,1)) );
     CALL_SUBTEST( cholesky(Matrix2d()) );
     CALL_SUBTEST( cholesky(Matrix3f()) );
     CALL_SUBTEST( cholesky(Matrix4d()) );
diff --git a/test/geo_alignedbox.cpp b/test/geo_alignedbox.cpp
index 1ccc0da14..88163b9b2 100644
--- a/test/geo_alignedbox.cpp
+++ b/test/geo_alignedbox.cpp
@@ -63,6 +63,13 @@ template<typename BoxType> void alignedbox(const BoxType& _box)
   VERIFY_IS_APPROX(hp1f.template cast<Scalar>(),b0);
   AlignedBox<Scalar,Dim> hp1d = b0.template cast<Scalar>();
   VERIFY_IS_APPROX(hp1d.template cast<Scalar>(),b0);
+
+  // alignment -- make sure there is no memory alignment assertion
+  BoxType *bp0 = new BoxType(dim);
+  BoxType *bp1 = new BoxType(dim);
+  bp0->extend(*bp1);
+  delete bp0;
+  delete bp1;
 }
 
 void test_geo_alignedbox()
diff --git a/test/geo_hyperplane.cpp b/test/geo_hyperplane.cpp
index de1ee8ba0..1a700fabf 100644
--- a/test/geo_hyperplane.cpp
+++ b/test/geo_hyperplane.cpp
@@ -121,8 +121,8 @@ template<typename Scalar> void lines()
     VERIFY_IS_APPROX(result, center);
 
     // check conversions between two types of lines
-    CoeffsType converted_coeffs(HLine(PLine(line_u)).coeffs());
-    converted_coeffs *= line_u.coeffs()(0)/converted_coeffs(0);
+    CoeffsType converted_coeffs = HLine(PLine(line_u)).coeffs();
+    converted_coeffs *= (line_u.coeffs()[0])/(converted_coeffs[0]);
     VERIFY(line_u.coeffs().isApprox(converted_coeffs));
   }
 }
diff --git a/test/qr.cpp b/test/qr.cpp
index add4aa580..345ea17fd 100644
--- a/test/qr.cpp
+++ b/test/qr.cpp
@@ -157,16 +157,17 @@ void test_qr()
 //     CALL_SUBTEST( qr(MatrixXf(12,8)) );
 //     CALL_SUBTEST( qr(MatrixXcd(5,5)) );
 //     CALL_SUBTEST( qr(MatrixXcd(7,3)) );
+    CALL_SUBTEST( qr(MatrixXf(47,47)) );
   }
 
   for(int i = 0; i < g_repeat; i++) {
     CALL_SUBTEST( qr_non_invertible<MatrixXf>() );
-//     CALL_SUBTEST( qr_non_invertible<MatrixXd>() );
+    CALL_SUBTEST( qr_non_invertible<MatrixXd>() );
     // TODO fix issue with complex
 //     CALL_SUBTEST( qr_non_invertible<MatrixXcf>() );
 //     CALL_SUBTEST( qr_non_invertible<MatrixXcd>() );
-//     CALL_SUBTEST( qr_invertible<MatrixXf>() );
-//     CALL_SUBTEST( qr_invertible<MatrixXd>() );
+    CALL_SUBTEST( qr_invertible<MatrixXf>() );
+    CALL_SUBTEST( qr_invertible<MatrixXd>() );
     // TODO fix issue with complex
 //     CALL_SUBTEST( qr_invertible<MatrixXcf>() );
 //     CALL_SUBTEST( qr_invertible<MatrixXcd>() );