diff --git a/tests/simulated2D.h b/tests/simulated2D.h
index f7a9a9284..22f3ee776 100644
--- a/tests/simulated2D.h
+++ b/tests/simulated2D.h
@@ -83,42 +83,43 @@ namespace simulated2D {
     }
   };
 
+  namespace {
+    /// Prior on a single pose
+    inline Point2 prior(const Point2& x) {
+      return x;
+    }
 
-  /// Prior on a single pose
-  inline Point2 prior(const Point2& x) {
-    return x;
-  }
+    /// Prior on a single pose, optionally returns derivative
+    Point2 prior(const Point2& x, boost::optional<Matrix&> H = boost::none) {
+      if (H) *H = gtsam::eye(2);
+      return x;
+    }
 
-  /// Prior on a single pose, optionally returns derivative
-  Point2 prior(const Point2& x, boost::optional<Matrix&> H = boost::none) {
-    if (H) *H = gtsam::eye(2);
-    return x;
-  }
+    /// odometry between two poses
+    inline Point2 odo(const Point2& x1, const Point2& x2) {
+      return x2 - x1;
+    }
 
-  /// odometry between two poses
-  inline Point2 odo(const Point2& x1, const Point2& x2) {
-    return x2 - x1;
-  }
-
-  /// odometry between two poses, optionally returns derivative
-  Point2 odo(const Point2& x1, const Point2& x2, boost::optional<Matrix&> H1 =
+    /// odometry between two poses, optionally returns derivative
+    Point2 odo(const Point2& x1, const Point2& x2, boost::optional<Matrix&> H1 =
       boost::none, boost::optional<Matrix&> H2 = boost::none) {
-    if (H1) *H1 = -gtsam::eye(2);
-    if (H2) *H2 = gtsam::eye(2);
-    return x2 - x1;
-  }
+        if (H1) *H1 = -gtsam::eye(2);
+        if (H2) *H2 = gtsam::eye(2);
+        return x2 - x1;
+    }
 
-  /// measurement between landmark and pose
-  inline Point2 mea(const Point2& x, const Point2& l) {
-    return l - x;
-  }
+    /// measurement between landmark and pose
+    inline Point2 mea(const Point2& x, const Point2& l) {
+      return l - x;
+    }
 
-  /// measurement between landmark and pose, optionally returns derivative
-  Point2 mea(const Point2& x, const Point2& l, boost::optional<Matrix&> H1 =
+    /// measurement between landmark and pose, optionally returns derivative
+    Point2 mea(const Point2& x, const Point2& l, boost::optional<Matrix&> H1 =
       boost::none, boost::optional<Matrix&> H2 = boost::none) {
-    if (H1) *H1 = -gtsam::eye(2);
-    if (H2) *H2 = gtsam::eye(2);
-    return l - x;
+        if (H1) *H1 = -gtsam::eye(2);
+        if (H2) *H2 = gtsam::eye(2);
+        return l - x;
+    }
   }
 
   /**
diff --git a/tests/smallExample.h b/tests/smallExample.h
index ea9f30b54..eb87e84e2 100644
--- a/tests/smallExample.h
+++ b/tests/smallExample.h
@@ -28,6 +28,7 @@
 
 namespace gtsam {
 namespace example {
+  namespace {
 
 typedef NonlinearFactorGraph Graph;
 
@@ -150,13 +151,9 @@ Ordering planarOrdering(size_t N);
 std::pair<GaussianFactorGraph, GaussianFactorGraph > splitOffPlanarTree(
     size_t N, const GaussianFactorGraph& original);
 
-} // example
-} // gtsam
 
 
 // Implementations
-namespace gtsam {
-namespace example {
 
 //  using namespace gtsam::noiseModel;
 
@@ -649,5 +646,6 @@ std::pair<GaussianFactorGraph, GaussianFactorGraph > splitOffPlanarTree(size_t N
 
 /* ************************************************************************* */
 
+} // anonymous namespace
 } // \namespace example
 } // \namespace gtsam