diff --git a/aegisub/libaegisub/lagi_pre.h b/aegisub/libaegisub/lagi_pre.h
index d7386da55..d010a5105 100644
--- a/aegisub/libaegisub/lagi_pre.h
+++ b/aegisub/libaegisub/lagi_pre.h
@@ -1,5 +1,7 @@
 #define LAGI_PRE
 
+#include "config.h"
+
 // Common C
 #include <errno.h>
 #include <math.h>