diff --git a/gcc/rust/ast/rust-macro.h b/gcc/rust/ast/rust-macro.h
index 478d3ab2f11..d13890a473a 100644
--- a/gcc/rust/ast/rust-macro.h
+++ b/gcc/rust/ast/rust-macro.h
@@ -906,4 +906,15 @@ private:
 } // namespace AST
 } // namespace Rust
 
+/* <https://stackoverflow.com/a/35304501> */
+namespace std {
+template <> struct hash<Rust::AST::MacroFragSpec::Kind>
+{
+  size_t operator() (const Rust::AST::MacroFragSpec::Kind &t) const noexcept
+  {
+    return size_t (t);
+  }
+};
+} // namespace std
+
 #endif
diff --git a/gcc/rust/parse/rust-parse-impl.h b/gcc/rust/parse/rust-parse-impl.h
index 5dfe29f4e90..7e6ab9b0287 100644
--- a/gcc/rust/parse/rust-parse-impl.h
+++ b/gcc/rust/parse/rust-parse-impl.h
@@ -20,9 +20,9 @@ along with GCC; see the file COPYING3.  If not see
 /* DO NOT INCLUDE ANYWHERE - this is automatically included with rust-parse.h
  * This is also the reason why there are no include guards. */
 
+#define INCLUDE_ALGORITHM
 #include "rust-diagnostics.h"
 #include "util/rust-make-unique.h"
-#include <algorithm>
 
 namespace Rust {
 // Left binding powers of operations.