diff --git a/libgrust/libproc_macro/ident.cc b/libgrust/libproc_macro/ident.cc
index 6ad9e7807f1..d7d588975d7 100644
--- a/libgrust/libproc_macro/ident.cc
+++ b/libgrust/libproc_macro/ident.cc
@@ -23,7 +23,10 @@
 
 #include <cstring>
 
+namespace Ident {
+
 extern "C" {
+
 Ident
 Ident__new (unsigned char *str, std::uint64_t len)
 {
@@ -72,3 +75,5 @@ Ident::make_ident (const unsigned char *str, std::uint64_t len, bool raw)
   std::memcpy (val, str, len);
   return {raw, val, len};
 }
+
+} // namespace Ident
diff --git a/libgrust/libproc_macro/ident.h b/libgrust/libproc_macro/ident.h
index 8ab7e6dc324..5a2a46a8c1f 100644
--- a/libgrust/libproc_macro/ident.h
+++ b/libgrust/libproc_macro/ident.h
@@ -26,6 +26,8 @@
 #include <cstdint>
 #include <string>
 
+namespace Ident {
+
 struct Ident
 {
   bool is_raw;
@@ -56,4 +58,6 @@ Ident
 Ident__clone (const Ident *ident);
 }
 
+} // namespace Ident
+
 #endif /* ! IDENT_H */