diff --git a/hook/iohook.c b/hook/iohook.c
index 3284173..04bf340 100644
--- a/hook/iohook.c
+++ b/hook/iohook.c
@@ -825,12 +825,12 @@ static DWORD WINAPI iohook_SetFilePointer(
     irp.seek_origin = dwMoveMethod;
 
     /* This is a clumsy API. In 32-bit mode lDistanceToMove is a signed 32-bit
-       int, but in 64-bit mode it is a 32-bit UNsigned int. Care must be taken
+       int, but in 64-bit mode it is a 32-bit unsigned int. Care must be taken
        with sign-extension vs zero-extension here. */
 
     if (lpDistanceToMoveHigh != NULL) {
         irp.seek_offset = ((( int64_t) *lpDistanceToMoveHigh) << 32) |
-                           ((uint64_t) lDistanceToMove      )        ;
+                           ((uint32_t) lDistanceToMove      )        ;
     } else {
         irp.seek_offset =   ( int64_t) lDistanceToMove;
     }