diff --git a/Ibm1130/ibm1130_disk.c b/Ibm1130/ibm1130_disk.c
index 56cddbb0..947fdc6e 100644
--- a/Ibm1130/ibm1130_disk.c
+++ b/Ibm1130/ibm1130_disk.c
@@ -533,7 +533,8 @@ static t_stat dsk_attach (UNIT *uptr, CONST char *cptr)
         return rval;
     }
 
-    if ((boot_drive>=0) && (dsk_unit[boot_drive].flags&UNIT_ATT)) {
+    if ((boot_drive >= 0) && 
+        (dsk_unit[boot_drive].flags & UNIT_ATT)) {
         disk_ready(TRUE);
         disk_unlocked(FALSE);
     }
@@ -562,7 +563,8 @@ static t_stat dsk_detach (UNIT *uptr)
     uptr->FUNC   = DSK_FUNC_IDLE;
     dsk_dsw[drv] = DSK_DSW_NOT_READY;
 
-    if ((boot_drive>=0) && (!dsk_unit[boot_drive].flags&UNIT_ATT)) {
+    if ((boot_drive >= 0) && 
+        (!(dsk_unit[boot_drive].flags & UNIT_ATT))) {
         disk_unlocked(TRUE);
         disk_ready(FALSE);
     }