diff --git a/include/glim/util/convert_to_string.hpp b/include/glim/util/convert_to_string.hpp
index 1249bf38..d85e4bc2 100644
--- a/include/glim/util/convert_to_string.hpp
+++ b/include/glim/util/convert_to_string.hpp
@@ -3,6 +3,7 @@
 #include <string>
 #include <vector>
 #include <fmt/format.h>
+#include <fmt/std.h>
 #include <Eigen/Core>
 #include <Eigen/Geometry>
 
@@ -54,4 +55,4 @@ inline std::string convert_to_string(const Eigen::Isometry3d& pose) {
   const Eigen::Quaterniond quat(pose.linear());
   return fmt::format("se3({:.6f},{:.6f},{:.6f},{:.6f},{:.6f},{:.6f},{:.6f})", trans.x(), trans.y(), trans.z(), quat.x(), quat.y(), quat.z(), quat.w());
 }
-}  // namespace glim
\ No newline at end of file
+}  // namespace glim