Index: lib/tsan/tests/rtl/tsan_test_util_linux.cc
===================================================================
--- lib/tsan/tests/rtl/tsan_test_util_linux.cc
+++ lib/tsan/tests/rtl/tsan_test_util_linux.cc
@@ -263,9 +263,14 @@
       }
     }
     CHECK_NE(tsan_mop, 0);
-    errno = ECHRNG;
+#if defined(__FreeBSD__)
+    const int ErrCode = ESOCKTNOSUPPORT;
+#else
+    const int ErrCode = ECHRNG;
+#endif
+    errno = ErrCode;
     tsan_mop(ev->ptr);
-    CHECK_EQ(errno, ECHRNG);  // In no case must errno be changed.
+    CHECK_EQ(errno, ErrCode);  // In no case must errno be changed.
     break;
   }
   case Event::VPTR_UPDATE: