diff --git a/test/geo_transformations.cpp b/test/geo_transformations.cpp
index 48393a5c6b..2e3a7169ad 100644
--- a/test/geo_transformations.cpp
+++ b/test/geo_transformations.cpp
@@ -18,6 +18,10 @@ Matrix<T,2,1> angleToVec(T a)
   return Matrix<T,2,1>(std::cos(a), std::sin(a));
 }
 
+// This permits to workaround a bug in clang/llvm code generation.
+EIGEN_DONT_INLINE
+void dont_over_optimize(void* x) { *(int*)(x)  = (*(int*)(x))&0xFFFF000 | (*(int*)(x))&0x0000FFFF; }
+
 template<typename Scalar, int Mode, int Options> void non_projective_only()
 {
     /* this test covers the following files:
@@ -224,12 +228,13 @@ template<typename Scalar, int Mode, int Options> void transformations()
 
   do {
     v3 = Vector3::Random();
+    dont_over_optimize(&v3);
   } while (v3.cwiseAbs().minCoeff()<NumTraits<Scalar>::epsilon());
   Translation3 tv3(v3);
   Transform3 t5(tv3);
   t4 = tv3;
   VERIFY_IS_APPROX(t5.matrix(), t4.matrix());
-  t4.translate(-v3);
+  t4.translate((-v3).eval());
   VERIFY_IS_APPROX(t4.matrix(), MatrixType::Identity());
   t4 *= tv3;
   VERIFY_IS_APPROX(t5.matrix(), t4.matrix());