diff --git a/src/floppy/fdc.c b/src/floppy/fdc.c
index 5184bbe5f..2667727b6 100644
--- a/src/floppy/fdc.c
+++ b/src/floppy/fdc.c
@@ -1902,7 +1902,8 @@ void
 fdc_sector_finishcompare(fdc_t *fdc, int satisfying)
 {
     fdc->stat = 0x10;
-    fdc->satisfying_sectors++;
+    if (satisfying)
+	fdc->satisfying_sectors++;
     fdc->inread = 0;
     fdc_callback(fdc);
 }