diff --git a/src/dj.c b/src/dj.c
index e36623e..3b5bc5f 100644
--- a/src/dj.c
+++ b/src/dj.c
@@ -268,7 +268,7 @@ int main(int argc, char *argv[]){
 
 			/* hack to intentionally get a partial read from Io_read */
 			if((skipping = MIN(io[0].seek, io[0].bs)) > 0)
-				io[0].bufuse = io[0].bs - io[0].seek;
+				io[0].bufuse = io[0].bs - (size_t)skipping;
 
 			t = io[0].bufuse;
 			if(Io_read(&io[0])->bufuse == t && !noerror && io[0].error == 0)