diff --git a/compilerplugins/clang/compat.hxx b/compilerplugins/clang/compat.hxx
index c9b2bc35b5f6..d04538e164b7 100644
--- a/compilerplugins/clang/compat.hxx
+++ b/compilerplugins/clang/compat.hxx
@@ -346,6 +346,12 @@ inline bool isPtrMemOp(clang::BinaryOperatorKind op) {
 #endif
 }
 
+#if CLANG_VERSION >= 70000
+constexpr llvm::sys::fs::OpenFlags OF_None = llvm::sys::fs::OF_None;
+#else
+constexpr llvm::sys::fs::OpenFlags OF_None = llvm::sys::fs::F_None;
+#endif
+
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/compilerplugins/clang/pluginhandler.cxx b/compilerplugins/clang/pluginhandler.cxx
index 315062969b25..35b5e03298b4 100644
--- a/compilerplugins/clang/pluginhandler.cxx
+++ b/compilerplugins/clang/pluginhandler.cxx
@@ -13,6 +13,7 @@
 #include <system_error>
 #include <utility>
 
+#include "compat.hxx"
 #include "plugin.hxx"
 #include "pluginhandler.hxx"
 
@@ -392,7 +393,7 @@ void PluginHandler::HandleTranslationUnit( ASTContext& context )
         bool bOk = false;
         std::error_code ec;
         std::unique_ptr<raw_fd_ostream> ostream(
-            new raw_fd_ostream(filename, ec, sys::fs::F_None));
+            new raw_fd_ostream(filename, ec, compat::OF_None));
         if( !ec)
         {
             it->second.write( *ostream );