1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/isdn/capi/capiutil.c b/drivers/isdn/capi/capiutil.c
index 4073d1684d07..b501d76209f0 100644
--- a/drivers/isdn/capi/capiutil.c
+++ b/drivers/isdn/capi/capiutil.c
@@ -207,6 +207,8 @@ static unsigned command_2_index(unsigned c, unsigned sc)
                 c = 0x9 + (c & 0x0f);
         else if (c == 0x41)
                 c = 0x9 + 0x1;
+        if (c > 0x18)
+                c = 0x00;
         return (sc & 3) * (0x9 + 0x9) + c;
 }