diff --git a/src/tools/chdman.c b/src/tools/chdman.c
index b3a172af9dd..f7bfe1b59d6 100644
--- a/src/tools/chdman.c
+++ b/src/tools/chdman.c
@@ -1323,6 +1323,7 @@ static int do_extract(int argc, char *argv[], int param)
 			err = CHDERR_WRITE_ERROR;
 			goto cleanup;
 		}
+		bytesremaining -= byteswritten;
 	}
 	progress(TRUE, "Extraction complete!                    \n");