diff --git a/src/m/pmax.h b/src/m/pmax.h
index 4ddb857b8e8..54216d9f3a5 100644
--- a/src/m/pmax.h
+++ b/src/m/pmax.h
@@ -27,13 +27,13 @@ NOTE-END  */
 #define START_FILES pre-crt0.o /usr/lib/cmplrs/cc/crt0.o
 #endif
 
-#ifdef __NetBSD__
+#if defined (__NetBSD__) || defined (__OpenBSD__)
 #undef START_FILES
 #undef RUN_TIME_REMAP
 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 #define CANNOT_DUMP
 #undef UNEXEC
-#endif /* NetBSD */
+#endif /* NetBSD || OpenBSD */
 
 /* Supposedly the following will overcome a kernel bug.  */
 #undef LD_SWITCH_MACHINE