diff --git a/reactos/base/setup/usetup/bootsup.c b/reactos/base/setup/usetup/bootsup.c
index 52b26ac9892..1bf2041f840 100644
--- a/reactos/base/setup/usetup/bootsup.c
+++ b/reactos/base/setup/usetup/bootsup.c
@@ -1088,7 +1088,7 @@ InstallFat32BootCodeToFile(
                          NULL,
                          NULL,
                          &IoStatusBlock,
-                         (NewBootSector + SECTORSIZE),
+                         ((PUCHAR)NewBootSector + SECTORSIZE),
                          SECTORSIZE,
                          &FileOffset,
                          NULL);