diff --git a/code/__byond_version_compat.dm b/code/__byond_version_compat.dm
index fc667f8b9dd82..8f77c0ad06325 100644
--- a/code/__byond_version_compat.dm
+++ b/code/__byond_version_compat.dm
@@ -20,7 +20,7 @@
 /savefile/byond_version = MIN_COMPILER_VERSION
 #endif
 
-#if defined(FASTDMM) || defined(CIBUILDING)
+#if defined(FASTDMM) || defined(CIBUILDING) || defined(SPACEMAN_DMM)
 #define YES_I_WANT_515
 #endif
 // Temporary 515 block until it is completely compatible.