diff --git a/include/rapidjson/schema.h b/include/rapidjson/schema.h
index 973e935..25990b6 100644
--- a/include/rapidjson/schema.h
+++ b/include/rapidjson/schema.h
@@ -24,13 +24,9 @@
 
 #if !defined(RAPIDJSON_SCHEMA_USE_INTERNALREGEX)
 #define RAPIDJSON_SCHEMA_USE_INTERNALREGEX 1
-#else
-#define RAPIDJSON_SCHEMA_USE_INTERNALREGEX 0
 #endif
 
-#if !RAPIDJSON_SCHEMA_USE_INTERNALREGEX && defined(RAPIDJSON_SCHEMA_USE_STDREGEX) && (__cplusplus >=201103L || (defined(_MSC_VER) && _MSC_VER >= 1800))
-#define RAPIDJSON_SCHEMA_USE_STDREGEX 1
-#else
+#if !defined(RAPIDJSON_SCHEMA_USE_STDREGEX) || !(__cplusplus >=201103L || (defined(_MSC_VER) && _MSC_VER >= 1800))
 #define RAPIDJSON_SCHEMA_USE_STDREGEX 0
 #endif