diff --git a/include/regex b/include/regex
index 18585003a..bd83d7c10 100644
--- a/include/regex
+++ b/include/regex
@@ -990,6 +990,10 @@ public:
 
 #if defined(__mips__) && defined(__GLIBC__)
     static const char_class_type __regex_word = static_cast<char_class_type>(_ISbit(15));
+#elif defined(__NetBSD__)
+    // NetBSD defines classes up to 0x2000
+    // see sys/ctype_bits.h, _CTYPE_Q
+    static const char_class_type __regex_word = 0x8000;
 #else
     static const char_class_type __regex_word = 0x80;
 #endif