diff --git a/src/to_string.cpp b/src/to_string.cpp
index 94b3043e..43bbd84c 100644
--- a/src/to_string.cpp
+++ b/src/to_string.cpp
@@ -36,6 +36,12 @@ str::to(const int int_)
   return fmt::format("{}",int_);
 }
 
+std::string
+str::to(const uint32_t i_)
+{
+  return fmt::format("{}",i_);
+}
+
 std::string
 str::to(const uint64_t uint64_)
 {