1 files changed, 3 insertions, 0 deletions

diff --git a/src/tparam.c b/src/tparam.c
index ae12e72ac7b..42be1f12884 100644
--- a/src/tparam.c
+++ b/src/tparam.c
@@ -290,6 +290,9 @@ tparam1 (string, outstring, len, up, left, argp)
             case 'D':           /* %D means weird Delta Data transformation.  */
               argp[0] -= 2 * (tem % 16);
               break;
+
+            default:
+              abort ();
             }
         }
       else