diff --git a/gcc/rust/backend/rust-compile-base.cc b/gcc/rust/backend/rust-compile-base.cc
index 6939bffec5d6..77fcb91520d7 100644
--- a/gcc/rust/backend/rust-compile-base.cc
+++ b/gcc/rust/backend/rust-compile-base.cc
@@ -463,7 +463,7 @@ HIRCompileBase::setup_abi_options (tree fndecl, ABI abi)
 
       break;
 
-    case Rust::ABI::WIN64:
+    case Rust::ABI::WIN_64:
       abi_tree = get_identifier ("ms_abi");
 
       break;
diff --git a/gcc/rust/util/rust-abi.cc b/gcc/rust/util/rust-abi.cc
index 05739e16660b..d17402e163e6 100644
--- a/gcc/rust/util/rust-abi.cc
+++ b/gcc/rust/util/rust-abi.cc
@@ -40,7 +40,7 @@ get_abi_from_string (const std::string &abi)
   else if (abi.compare ("sysv64") == 0)
     return Rust::ABI::SYSV64;
   else if (abi.compare ("win64") == 0)
-    return Rust::ABI::WIN64;
+    return Rust::ABI::WIN_64;
 
   return Rust::ABI::UNKNOWN;
 }
@@ -64,7 +64,7 @@ get_string_from_abi (Rust::ABI abi)
       return "fastcall";
     case Rust::ABI::SYSV64:
       return "sysv64";
-    case Rust::ABI::WIN64:
+    case Rust::ABI::WIN_64:
       return "win64";
 
     case Rust::ABI::UNKNOWN:
diff --git a/gcc/rust/util/rust-abi.h b/gcc/rust/util/rust-abi.h
index d794cc35fb3a..a0180ed4d951 100644
--- a/gcc/rust/util/rust-abi.h
+++ b/gcc/rust/util/rust-abi.h
@@ -30,7 +30,7 @@ enum ABI
   CDECL,
   STDCALL,
   FASTCALL,
-  WIN64,
+  WIN_64,
   SYSV64
 };