Index: src/google/protobuf/port_def.inc
--- src/google/protobuf/port_def.inc.orig
+++ src/google/protobuf/port_def.inc
@@ -746,7 +746,7 @@ static_assert(PROTOBUF_ABSL_MIN(20230125, 3),
 #undef GID_MAX
 #endif  // defined(ANDROID) || defined(__ANDROID__)
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
 // Inconvenient macro names from /usr/include/sys/param.h.
 #pragma push_macro("TRUE")
 #undef TRUE
