diff --git a/dlls/schannel/tests/main.c b/dlls/schannel/tests/main.c
index 69f4bd670bd..af245d85c04 100644
--- a/dlls/schannel/tests/main.c
+++ b/dlls/schannel/tests/main.c
@@ -33,9 +33,9 @@
 #include "wine/test.h"
 
 /* Helper macros to find the size of SECPKG_FUNCTION_TABLE */
-#define SECPKG_FUNCTION_TABLE_SIZE_1 offsetof(SECPKG_FUNCTION_TABLE, \
+#define SECPKG_FUNCTION_TABLE_SIZE_1 FIELD_OFFSET(SECPKG_FUNCTION_TABLE, \
     SetContextAttributes)
-#define SECPKG_FUNCTION_TABLE_SIZE_2 offsetof(SECPKG_FUNCTION_TABLE, \
+#define SECPKG_FUNCTION_TABLE_SIZE_2 FIELD_OFFSET(SECPKG_FUNCTION_TABLE, \
     SetCredentialsAttributes)
 #define SECPKG_FUNCTION_TABLE_SIZE_3 sizeof(SECPKG_FUNCTION_TABLE)