diff --git a/libraries/chain/hardfork.d/SON.hf b/libraries/chain/hardfork.d/SON.hf
index e8ec3313..4bc7496f 100644
--- a/libraries/chain/hardfork.d/SON.hf
+++ b/libraries/chain/hardfork.d/SON.hf
@@ -2,3 +2,4 @@
 #ifndef HARDFORK_SON_TIME
 #include <ctime>
 #define HARDFORK_SON_TIME (fc::time_point_sec( 1603152000 ))
+#endif