diff --git a/aegisub/libaegisub/lagi_pre.h b/aegisub/libaegisub/lagi_pre.h
index 6e342944a..a8276860e 100644
--- a/aegisub/libaegisub/lagi_pre.h
+++ b/aegisub/libaegisub/lagi_pre.h
@@ -25,6 +25,7 @@
 
 // Common C++
 #include <deque>
+#include <climits>
 #include <fstream>
 #include <iostream>
 #include <iterator>