diff --git a/dlls/crypt32/encode.c b/dlls/crypt32/encode.c
index 7359ed88a64..e6695cf9a0c 100644
--- a/dlls/crypt32/encode.c
+++ b/dlls/crypt32/encode.c
@@ -1215,7 +1215,7 @@ struct DERSetDescriptor
     DWORD                   cItems;
     const void             *items;
     size_t                  itemSize;
-    off_t                   itemOffset;
+    size_t                  itemOffset;
     CryptEncodeObjectExFunc encode;
 };