diff --git a/gtsam_unstable/nonlinear/FixedLagSmoother.cpp b/gtsam_unstable/nonlinear/FixedLagSmoother.cpp
index 62ee07a16..9c04f0eec 100644
--- a/gtsam_unstable/nonlinear/FixedLagSmoother.cpp
+++ b/gtsam_unstable/nonlinear/FixedLagSmoother.cpp
@@ -21,6 +21,15 @@
 
 namespace gtsam {
 
+/* ************************************************************************* */
+void FixedLagSmoother::Result::print() const {
+  std::cout << "Nr iterations: " << iterations << '\n'
+            << "Nr intermediateSteps: " << intermediateSteps << '\n'
+            << "Nr nonlinear variables: " << nonlinearVariables << '\n'
+            << "Nr linear variables: " << linearVariables << '\n'
+            << "error: " << error << std::endl;
+}
+
 /* ************************************************************************* */
 void FixedLagSmoother::print(const std::string& s, const KeyFormatter& keyFormatter) const {
   std::cout << s;
diff --git a/gtsam_unstable/nonlinear/FixedLagSmoother.h b/gtsam_unstable/nonlinear/FixedLagSmoother.h
index 37fdce5a2..7b26c7021 100644
--- a/gtsam_unstable/nonlinear/FixedLagSmoother.h
+++ b/gtsam_unstable/nonlinear/FixedLagSmoother.h
@@ -59,13 +59,7 @@ public:
     size_t getNonlinearVariables() const { return nonlinearVariables; }
     size_t getLinearVariables() const { return linearVariables; }
     double getError() const { return error; }
-    void print() const{
-      std::cout << "Nr iterations: " << iterations << std::endl;
-      std::cout << "Nr intermediateSteps: " << intermediateSteps << std::endl;
-      std::cout << "Nr nonlinear variables: " << nonlinearVariables << std::endl;
-      std::cout << "Nr linear variables: " << linearVariables << std::endl;
-      std::cout << "error: " << error << std::endl;
-    }
+    void print() const;
   };
 
   /** default constructor */