diff --git a/library/windows/kernel32-structs.factor b/library/windows/kernel32-structs.factor
index 08ef316915..31beaee431 100644
--- a/library/windows/kernel32-structs.factor
+++ b/library/windows/kernel32-structs.factor
@@ -148,6 +148,6 @@ BEGIN-STRUCT: OSVERSIONINFO
     FIELD: DWORD dwMinorVersion
     FIELD: DWORD dwBuildNumber
     FIELD: DWORD dwPlatformId
-    FIELD: char[128] szCSDVersion
+    ! FIELD: char[128] szCSDVersion
 END-STRUCT
 TYPEDEF: void* LPOSVERSIONINFO