diff --git a/cmake/string_catalog.cmake b/cmake/string_catalog.cmake
index 09db54bc..3dc27ac7 100644
--- a/cmake/string_catalog.cmake
+++ b/cmake/string_catalog.cmake
@@ -2,7 +2,7 @@ function(gen_str_catalog)
     set(options "")
     set(oneValueArgs OUTPUT_CPP OUTPUT_XML OUTPUT_JSON GEN_STR_CATALOG
                      OUTPUT_LIB)
-    set(multiValueArgs INPUT_JSON INPUT_LIBS)
+    set(multiValueArgs INPUT_JSON INPUT_LIBS INPUT_HEADERS)
     cmake_parse_arguments(SC "${options}" "${oneValueArgs}" "${multiValueArgs}"
                           ${ARGN})
 
@@ -19,13 +19,15 @@ function(gen_str_catalog)
     endforeach()
 
     list(TRANSFORM SC_INPUT_JSON PREPEND "${CMAKE_CURRENT_SOURCE_DIR}/")
+    list(TRANSFORM SC_INPUT_HEADERS PREPEND "${CMAKE_CURRENT_SOURCE_DIR}/")
 
     add_custom_command(
         OUTPUT ${SC_OUTPUT_CPP} ${SC_OUTPUT_JSON} ${SC_OUTPUT_XML}
         COMMAND
             ${Python3_EXECUTABLE} ${SC_GEN_STR_CATALOG} --input ${UNDEFS}
-            --json_input ${SC_INPUT_JSON} --cpp_output ${SC_OUTPUT_CPP}
-            --json_output ${SC_OUTPUT_JSON} --xml_output ${SC_OUTPUT_XML}
+            --json_input ${SC_INPUT_JSON} --cpp_headers ${SC_INPUT_HEADERS}
+            --cpp_output ${SC_OUTPUT_CPP} --json_output ${SC_OUTPUT_JSON}
+            --xml_output ${SC_OUTPUT_XML}
         DEPENDS ${UNDEFS} ${INPUT_JSON} ${SC_GEN_STR_CATALOG})
 
     add_library(${SC_OUTPUT_LIB} STATIC ${SC_OUTPUT_CPP})
diff --git a/include/sc/format.hpp b/include/sc/format.hpp
index 19b1d46a..c4c4c085 100644
--- a/include/sc/format.hpp
+++ b/include/sc/format.hpp
@@ -14,6 +14,7 @@
 
 #include <algorithm>
 #include <array>
+#include <concepts>
 #include <cstddef>
 #include <iterator>
 #include <type_traits>
@@ -22,10 +23,12 @@
 namespace sc {
 namespace detail {
 template <typename T>
-concept compile_time_field = requires { T::value; };
+concept compile_time_field =
+    std::same_as<typename T::value_type,
+                 std::remove_cvref_t<decltype(T::value)>>;
 
 template <compile_time_field T> [[nodiscard]] CONSTEVAL auto field_value(T) {
-    if constexpr (std::is_enum_v<decltype(T::value)>) {
+    if constexpr (std::is_enum_v<typename T::value_type>) {
         return stdx::enum_as_string<T::value>();
     } else {
         return T::value;
diff --git a/include/sc/string_constant.hpp b/include/sc/string_constant.hpp
index e0a5a0e2..17c32729 100644
--- a/include/sc/string_constant.hpp
+++ b/include/sc/string_constant.hpp
@@ -10,16 +10,17 @@
 
 namespace sc {
 template <typename CharT, CharT... chars> struct string_constant {
+    using value_type = std::basic_string_view<CharT>;
+
   private:
-    using view_t = std::basic_string_view<CharT>;
     constexpr static std::array<CharT, sizeof...(chars)> storage{chars...};
 
     using size_type = int;
-    using const_iterator = typename view_t::const_iterator;
+    using const_iterator = typename value_type::const_iterator;
     constexpr static size_type npos = std::numeric_limits<size_type>::max();
 
   public:
-    constexpr static view_t value{storage.data(), sizeof...(chars)};
+    constexpr static value_type value{storage.data(), sizeof...(chars)};
 
     constexpr static auto begin() noexcept { return std::cbegin(storage); }
     constexpr static auto end() noexcept { return std::cend(storage); }
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8558d8d0..17b2b49c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -94,7 +94,9 @@ gen_str_catalog(
     catalog1_lib
     catalog2_lib
     INPUT_JSON
-    log/catalog_extra.json)
+    log/catalog_extra.json
+    INPUT_HEADERS
+    log/catalog_enums.hpp)
 
 add_unit_test(
     log_catalog_test
diff --git a/test/log/catalog2_lib.cpp b/test/log/catalog2_lib.cpp
index 63081e98..e35114ca 100644
--- a/test/log/catalog2_lib.cpp
+++ b/test/log/catalog2_lib.cpp
@@ -1,4 +1,5 @@
 #include "catalog_concurrency.hpp"
+#include "catalog_enums.hpp"
 
 #include <conc/concurrency.hpp>
 #include <log/catalog/mipi_encoder.hpp>
@@ -16,9 +17,16 @@ struct test_log_args_destination {
 } // namespace
 
 auto log_two_rt_args() -> void;
+auto log_rt_enum_arg() -> void;
 
 auto log_two_rt_args() -> void {
     auto cfg = logging::mipi::config{test_log_args_destination{}};
     cfg.logger.log_msg<logging::level::TRACE>(
         format("D string with {} and {} placeholder"_sc, 1, 2));
 }
+
+auto log_rt_enum_arg() -> void {
+    auto cfg = logging::mipi::config{test_log_args_destination{}};
+    cfg.logger.log_msg<logging::level::TRACE>(
+        format("E string with {} placeholder"_sc, E::value));
+}
diff --git a/test/log/catalog_app.cpp b/test/log/catalog_app.cpp
index 9a7e453b..3fadb826 100644
--- a/test/log/catalog_app.cpp
+++ b/test/log/catalog_app.cpp
@@ -10,6 +10,8 @@ extern int log_calls;
 extern auto log_zero_args() -> void;
 extern auto log_one_ct_arg() -> void;
 extern auto log_one_rt_arg() -> void;
+extern auto log_two_rt_args() -> void;
+extern auto log_rt_enum_arg() -> void;
 
 TEST_CASE("log zero arguments", "[catalog]") {
     test_critical_section::count = 0;
@@ -34,3 +36,19 @@ TEST_CASE("log one runtime argument", "[catalog]") {
     CHECK(test_critical_section::count == 2);
     CHECK(log_calls == 1);
 }
+
+TEST_CASE("log two runtime arguments", "[catalog]") {
+    log_calls = 0;
+    test_critical_section::count = 0;
+    log_two_rt_args();
+    CHECK(test_critical_section::count == 2);
+    CHECK(log_calls == 1);
+}
+
+TEST_CASE("log runtime enum argument", "[catalog]") {
+    log_calls = 0;
+    test_critical_section::count = 0;
+    log_rt_enum_arg();
+    CHECK(test_critical_section::count == 2);
+    CHECK(log_calls == 1);
+}
diff --git a/test/log/catalog_enums.hpp b/test/log/catalog_enums.hpp
new file mode 100644
index 00000000..152892d7
--- /dev/null
+++ b/test/log/catalog_enums.hpp
@@ -0,0 +1,3 @@
+#pragma once
+
+enum struct E { value = 42 };
diff --git a/tools/gen_str_catalog.py b/tools/gen_str_catalog.py
index 72fd3aa5..fc8af98f 100755
--- a/tools/gen_str_catalog.py
+++ b/tools/gen_str_catalog.py
@@ -111,9 +111,10 @@ def make_cpp_defn(types, msg):
 }}"""
 
 
-def write_cpp(messages, filename):
+def write_cpp(messages, extra_headers, filename):
     with open(filename, "w") as f:
-        f.write("#include <log/catalog/catalog.hpp>\n\n")
+        f.write("\n".join(f'#include "{h}"' for h in extra_headers))
+        f.write("\n#include <log/catalog/catalog.hpp>\n\n")
         cpp_defns = (make_cpp_defn(k, v) for k, v in messages.items())
         f.write("\n".join(cpp_defns))
 
@@ -200,6 +201,13 @@ def parse_cmdline():
         default=[],
         help="Extra JSON inputs to copy into the output.",
     )
+    parser.add_argument(
+        "--cpp_headers",
+        type=str,
+        nargs="*",
+        default=[],
+        help="Extra C++ headers to include in the C++ output.",
+    )
     parser.add_argument(
         "--client_name",
         type=str,
@@ -235,7 +243,7 @@ def main():
         raise Exception(f"{str(e)} from file {args.input}")
 
     if args.cpp_output:
-        write_cpp(messages, args.cpp_output)
+        write_cpp(messages, args.cpp_headers, args.cpp_output)
 
     if args.json_output:
         write_json(messages, args.json_input, args.json_output)