diff --git a/luna/src/SystemError.cpp b/luna/src/SystemError.cpp
index 74586781..5237d5a7 100644
--- a/luna/src/SystemError.cpp
+++ b/luna/src/SystemError.cpp
@@ -1,3 +1,4 @@
+#define _LUNA_SYSTEM_ERROR_EXTENSIONS
 #include <luna/SystemError.h>
 
 const char* error_string(int error)