diff --git a/test/replace.cpp b/test/replace.cpp
index c7fb4921..b0c10714 100644
--- a/test/replace.cpp
+++ b/test/replace.cpp
@@ -379,7 +379,7 @@ TEST(replace, replace_unicode)
 }
 
 // TODO: Document this.
-#if BOOST_PARSER_USE_CONCEPTS && !defined(__GNUC__) || 12 <= __GNUC__
+#if BOOST_PARSER_USE_CONCEPTS && (!defined(__GNUC__) || 12 <= __GNUC__)
 // Older GCCs don't like the use of temporaries like the std::string("foo")
 // below.  This causes | join to break.
 TEST(replace, join_compat)
@@ -451,4 +451,4 @@ TEST(replace, doc_examples)
     }
 }
 
-#endif
\ No newline at end of file
+#endif