diff --git a/gtsam_unstable/base/FixedVector.h b/gtsam_unstable/base/FixedVector.h
index 53a9190ce..6df24fb4f 100644
--- a/gtsam_unstable/base/FixedVector.h
+++ b/gtsam_unstable/base/FixedVector.h
@@ -52,6 +52,7 @@ public:
    *  NOTE: this will throw warnings/explode if there is no argument
    *  before the variadic section, so there is a meaningless size argument.
    */
+  /*
   FixedVector(size_t n, ...) {
       va_list ap;
       va_start(ap, n);
@@ -61,7 +62,7 @@ public:
       }
       va_end(ap);
   }
-
+  */
   /**
    * Create vector initialized to a constant value
    * @param value constant value
diff --git a/gtsam_unstable/base/tests/testFixedVector.cpp b/gtsam_unstable/base/tests/testFixedVector.cpp
index 54452e2c4..e5e297b7c 100644
--- a/gtsam_unstable/base/tests/testFixedVector.cpp
+++ b/gtsam_unstable/base/tests/testFixedVector.cpp
@@ -37,7 +37,7 @@ TEST( testFixedVector, conversions ) {
 
 /* ************************************************************************* */
 TEST( testFixedVector, variable_constructor ) {
-  TestVector3 act(3, 1.0, 2.0, 3.0);
+  TestVector3 act((Vector(3) << 1.0, 2.0, 3.0));
   EXPECT_DOUBLES_EQUAL(1.0, act(0), tol);
   EXPECT_DOUBLES_EQUAL(2.0, act(1), tol);
   EXPECT_DOUBLES_EQUAL(3.0, act(2), tol);
@@ -45,8 +45,9 @@ TEST( testFixedVector, variable_constructor ) {
 
 /* ************************************************************************* */
 TEST( testFixedVector, equals ) {
-  TestVector3 vec1(3, 1.0, 2.0, 3.0), vec2(3, 1.0, 2.0, 3.0), vec3(3, 2.0, 3.0, 4.0);
-  TestVector5 vec4(5, 1.0, 2.0, 3.0, 4.0, 5.0);
+  TestVector3 vec1((Vector(3) << 1.0, 2.0, 3.0)), vec2((Vector(3) << 1.0, 2.0, 3.0)),
+      vec3((Vector(3) << 2.0, 3.0, 4.0));
+  TestVector5 vec4((Vector(5) << 1.0, 2.0, 3.0, 4.0, 5.0));
 
   EXPECT(assert_equal(vec1, vec1, tol));
   EXPECT(assert_equal(vec1, vec2, tol));
@@ -60,23 +61,23 @@ TEST( testFixedVector, equals ) {
 /* ************************************************************************* */
 TEST( testFixedVector, static_constructors ) {
   TestVector3 actZero = TestVector3::zero();
-  TestVector3 expZero(3, 0.0, 0.0, 0.0);
+  TestVector3 expZero((Vector(3) << 0.0, 0.0, 0.0));
   EXPECT(assert_equal(expZero, actZero, tol));
 
   TestVector3 actOnes = TestVector3::ones();
-  TestVector3 expOnes(3, 1.0, 1.0, 1.0);
+  TestVector3 expOnes((Vector(3) << 1.0, 1.0, 1.0));
   EXPECT(assert_equal(expOnes, actOnes, tol));
 
   TestVector3 actRepeat = TestVector3::repeat(2.3);
-  TestVector3 expRepeat(3, 2.3, 2.3, 2.3);
+  TestVector3 expRepeat((Vector(3) << 2.3, 2.3, 2.3));
   EXPECT(assert_equal(expRepeat, actRepeat, tol));
 
   TestVector3 actBasis = TestVector3::basis(1);
-  TestVector3 expBasis(3, 0.0, 1.0, 0.0);
+  TestVector3 expBasis((Vector(3) << 0.0, 1.0, 0.0));
   EXPECT(assert_equal(expBasis, actBasis, tol));
 
   TestVector3 actDelta = TestVector3::delta(1, 2.3);
-  TestVector3 expDelta(3, 0.0, 2.3, 0.0);
+  TestVector3 expDelta((Vector(3) << 0.0, 2.3, 0.0));
   EXPECT(assert_equal(expDelta, actDelta, tol));
 }