diff --git a/src/easymesh/csgbsp.cpp b/src/easymesh/csgbsp.cpp
index 8f2153de..2972715f 100644
--- a/src/easymesh/csgbsp.cpp
+++ b/src/easymesh/csgbsp.cpp
@@ -19,6 +19,7 @@
 #endif
 
 #include "core.h"
+#include <lol/math/geometry.h>
 
 namespace lol
 {