diff --git a/src/csgterm.cc b/src/csgterm.cc
index bfa937b0..dc2a93dc 100644
--- a/src/csgterm.cc
+++ b/src/csgterm.cc
@@ -74,26 +74,16 @@ shared_ptr<CSGTerm> CSGTerm::createCSGTerm(type_e type, shared_ptr<CSGTerm> left
 	const BoundingBox &rightbox = right->getBoundingBox();
 	Vector3d newmin, newmax;
 	if (type == TYPE_INTERSECTION) {
-#if EIGEN_WORLD_VERSION == 2
-		newmin = leftbox.min().cwise().max( rightbox.min() );
-		newmax = leftbox.max().cwise().min( rightbox.max() );
-#else
 		newmin = leftbox.min().array().cwiseMax( rightbox.min().array() );
 		newmax = leftbox.max().array().cwiseMin( rightbox.max().array() );
-#endif
 		BoundingBox newbox( newmin, newmax );
 		if (newbox.isNull()) {
 			return shared_ptr<CSGTerm>(); // Prune entire product
 		}
 	}
 	else if (type == TYPE_DIFFERENCE) {
-#if EIGEN_WORLD_VERSION == 2
-		newmin = leftbox.min().cwise().max( rightbox.min() );
-		newmax = leftbox.max().cwise().min( rightbox.max() );
-#else
 		newmin = leftbox.min().array().cwiseMax( rightbox.min().array() );
 		newmax = leftbox.max().array().cwiseMin( rightbox.max().array() );
-#endif
 		BoundingBox newbox( newmin, newmax );
 		if (newbox.isNull()) {
 			return left; // Prune the negative component
@@ -143,23 +133,13 @@ void CSGTerm::initBoundingBox()
 		Vector3d newmin, newmax;
 		switch (this->type) {
 		case TYPE_UNION:
-#if EIGEN_WORLD_VERSION == 2
-			newmin = leftbox.min().cwise().min( rightbox.min() );
-			newmax = leftbox.max().cwise().max( rightbox.max() );
-#else
 			newmin = leftbox.min().array().cwiseMin( rightbox.min().array() );
 			newmax = leftbox.max().array().cwiseMax( rightbox.max().array() );
-#endif
 			this->bbox = this->m * BoundingBox( newmin, newmax );
 			break;
 		case TYPE_INTERSECTION:
-#if EIGEN_WORLD_VERSION == 2
-			newmin = leftbox.min().cwise().max( rightbox.min() );
-			newmax = leftbox.max().cwise().min( rightbox.max() );
-#else
 			newmin = leftbox.min().array().cwiseMax( rightbox.min().array() );
 			newmax = leftbox.max().array().cwiseMin( rightbox.max().array() );
-#endif
 			this->bbox = this->m * BoundingBox( newmin, newmax );
 			break;
 		case TYPE_DIFFERENCE:
diff --git a/src/linalg.h b/src/linalg.h
index a8409baf..97d21007 100644
--- a/src/linalg.h
+++ b/src/linalg.h
@@ -15,13 +15,8 @@ typedef Eigen::AlignedBox<double, 3> BoundingBox;
 using Eigen::Matrix3f;
 using Eigen::Matrix3d;
 using Eigen::Matrix4d;
-#if EIGEN_WORLD_VERSION >= 3
 #define Transform3d Eigen::Affine3d
 #define Transform2d Eigen::Affine2d
-#else
-using Eigen::Transform3d;
-using Eigen::Transform2d;
-#endif
 
 bool matrix_contains_infinity( const Transform3d &m );
 bool matrix_contains_nan( const Transform3d &m );