diff --git a/src/DMAPI/tgs/core/_definitions.dm b/src/DMAPI/tgs/core/_definitions.dm
index ebf6d17c2a..7f202dc996 100644
--- a/src/DMAPI/tgs/core/_definitions.dm
+++ b/src/DMAPI/tgs/core/_definitions.dm
@@ -1,2 +1,6 @@
+#if DM_VERSION < 510
+#error The TGS DMAPI does not support BYOND versions < 510!
+#endif
+
 #define TGS_UNIMPLEMENTED "___unimplemented"
 #define TGS_VERSION_PARAMETER "server_service_version"