Index: compiler-rt/trunk/lib/ubsan/ubsan_platform.h
===================================================================
--- compiler-rt/trunk/lib/ubsan/ubsan_platform.h
+++ compiler-rt/trunk/lib/ubsan/ubsan_platform.h
@@ -15,7 +15,8 @@
 
 // Other platforms should be easy to add, and probably work as-is.
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) ||        \
-    defined(__NetBSD__) || (defined(__sun__) && defined(__svr4__)) ||          \
+    defined(__NetBSD__) || defined(__OpenBSD__) || \
+    (defined(__sun__) && defined(__svr4__)) || \
     defined(_WIN32) || defined(__Fuchsia__)
 # define CAN_SANITIZE_UB 1
 #else