diff --git a/fmt/format.cc b/fmt/format.cc
index 09d2ea9fdac6..afd28fa9cd8a 100644
--- a/fmt/format.cc
+++ b/fmt/format.cc
@@ -396,51 +396,6 @@ FMT_FUNC void format_system_error(
   fmt::format_error_code(out, error_code, message);  // 'fmt::' is for bcc32.
 }
 
-template <typename Char>
-void internal::ArgMap<Char>::init(const ArgList &args) {
-  if (!map_.empty())
-    return;
-  typedef internal::NamedArg<Char> NamedArg;
-  const NamedArg *named_arg = FMT_NULL;
-  bool use_values =
-      args.type(ArgList::MAX_PACKED_ARGS - 1) == internal::Arg::NONE;
-  if (use_values) {
-    for (unsigned i = 0;/*nothing*/; ++i) {
-      internal::Arg::Type arg_type = args.type(i);
-      switch (arg_type) {
-      case internal::Arg::NONE:
-        return;
-      case internal::Arg::NAMED_ARG:
-        named_arg = static_cast<const NamedArg*>(args.values_[i].pointer);
-        map_.push_back(Pair(named_arg->name, *named_arg));
-        break;
-      default:
-        /*nothing*/;
-      }
-    }
-    return;
-  }
-  for (unsigned i = 0; i != ArgList::MAX_PACKED_ARGS; ++i) {
-    internal::Arg::Type arg_type = args.type(i);
-    if (arg_type == internal::Arg::NAMED_ARG) {
-      named_arg = static_cast<const NamedArg*>(args.args_[i].pointer);
-      map_.push_back(Pair(named_arg->name, *named_arg));
-    }
-  }
-  for (unsigned i = ArgList::MAX_PACKED_ARGS;/*nothing*/; ++i) {
-    switch (args.args_[i].type) {
-    case internal::Arg::NONE:
-      return;
-    case internal::Arg::NAMED_ARG:
-      named_arg = static_cast<const NamedArg*>(args.args_[i].pointer);
-      map_.push_back(Pair(named_arg->name, *named_arg));
-      break;
-    default:
-      /*nothing*/;
-    }
-  }
-}
-
 template <typename Char>
 void internal::FixedBuffer<Char>::grow(std::size_t) {
   FMT_THROW(std::runtime_error("buffer overflow"));
@@ -502,8 +457,6 @@ template struct internal::BasicData<void>;
 
 template void internal::FixedBuffer<char>::grow(std::size_t);
 
-template void internal::ArgMap<char>::init(const ArgList &args);
-
 template FMT_API int internal::CharTraits<char>::format_float(
     char *buffer, std::size_t size, const char *format,
     unsigned width, int precision, double value);
@@ -516,8 +469,6 @@ template FMT_API int internal::CharTraits<char>::format_float(
 
 template void internal::FixedBuffer<wchar_t>::grow(std::size_t);
 
-template void internal::ArgMap<wchar_t>::init(const ArgList &args);
-
 template FMT_API int internal::CharTraits<wchar_t>::format_float(
     wchar_t *buffer, std::size_t size, const wchar_t *format,
     unsigned width, int precision, double value);
diff --git a/fmt/format.h b/fmt/format.h
index e93371e91045..29c1f8f9e2c8 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -1937,7 +1937,7 @@ class ArgMap {
   MapType map_;
 
  public:
-  FMT_API void init(const ArgList &args);
+  void init(const ArgList &args);
 
   const internal::Arg *find(const fmt::BasicStringRef<Char> &name) const {
     // The list is unsorted, so just return the first matching name.
@@ -1950,6 +1950,51 @@ class ArgMap {
   }
 };
 
+template <typename Char>
+void ArgMap<Char>::init(const ArgList &args) {
+  if (!map_.empty())
+    return;
+  typedef internal::NamedArg<Char> NamedArg;
+  const NamedArg *named_arg = FMT_NULL;
+  bool use_values =
+      args.type(ArgList::MAX_PACKED_ARGS - 1) == internal::Arg::NONE;
+  if (use_values) {
+    for (unsigned i = 0;/*nothing*/; ++i) {
+      internal::Arg::Type arg_type = args.type(i);
+      switch (arg_type) {
+      case internal::Arg::NONE:
+        return;
+      case internal::Arg::NAMED_ARG:
+        named_arg = static_cast<const NamedArg*>(args.values_[i].pointer);
+        map_.push_back(Pair(named_arg->name, *named_arg));
+        break;
+      default:
+        /*nothing*/;
+      }
+    }
+    return;
+  }
+  for (unsigned i = 0; i != ArgList::MAX_PACKED_ARGS; ++i) {
+    internal::Arg::Type arg_type = args.type(i);
+    if (arg_type == internal::Arg::NAMED_ARG) {
+      named_arg = static_cast<const NamedArg*>(args.args_[i].pointer);
+      map_.push_back(Pair(named_arg->name, *named_arg));
+    }
+  }
+  for (unsigned i = ArgList::MAX_PACKED_ARGS;/*nothing*/; ++i) {
+    switch (args.args_[i].type) {
+    case internal::Arg::NONE:
+      return;
+    case internal::Arg::NAMED_ARG:
+      named_arg = static_cast<const NamedArg*>(args.args_[i].pointer);
+      map_.push_back(Pair(named_arg->name, *named_arg));
+      break;
+    default:
+      /*nothing*/;
+    }
+  }
+}
+
 template <typename Impl, typename Char, typename Spec = fmt::FormatSpec>
 class ArgFormatterBase : public ArgVisitor<Impl, void> {
  private: