diff --git a/src/CalcManager/winerror_cross_platform.h b/src/CalcManager/winerror_cross_platform.h
index 8a42c49a..07b6cd3f 100644
--- a/src/CalcManager/winerror_cross_platform.h
+++ b/src/CalcManager/winerror_cross_platform.h
@@ -6,7 +6,7 @@
 
 #else
 
-#include "CalcErr.h"
+#include "Ratpack/CalcErr.h"
 
 #define E_ACCESSDENIED 0x80070005
 #define E_FAIL 0x80004005