diff --git a/src/ripple/unity/rocksdb.cpp b/src/ripple/unity/rocksdb.cpp
index 6faea0cc4..95f83057d 100644
--- a/src/ripple/unity/rocksdb.cpp
+++ b/src/ripple/unity/rocksdb.cpp
@@ -28,7 +28,7 @@
 #else
 # define ROCKSDB_PLATFORM_POSIX
 # if BEAST_MAC || BEAST_IOS
-#  define OS_MACOSX
+#  define OS_MACOSX 1
 # elif BEAST_BSD
 #  define OS_FREEBSD
 # else
diff --git a/src/ripple/unity/rocksdb.h b/src/ripple/unity/rocksdb.h
index 896f7425e..fca71dcca 100644
--- a/src/ripple/unity/rocksdb.h
+++ b/src/ripple/unity/rocksdb.h
@@ -28,7 +28,7 @@
 #else
 # define ROCKSDB_PLATFORM_POSIX
 # if BEAST_MAC || BEAST_IOS
-#  define OS_MACOSX
+#  define OS_MACOSX 1
 # elif BEAST_BSD
 #  define OS_FREEBSD
 # else