diff --git a/src/unit.h b/src/unit.h
index 3f4bbd9ed..5d68583f1 100644
--- a/src/unit.h
+++ b/src/unit.h
@@ -39,7 +39,7 @@ typedef enum UnitDependency UnitDependency;
 #include "socket-util.h"
 #include "execute.h"
 
-#define UNIT_NAME_MAX 128
+#define UNIT_NAME_MAX 256
 #define DEFAULT_TIMEOUT_USEC (60*USEC_PER_SEC)
 #define DEFAULT_RESTART_USEC (100*USEC_PER_MSEC)