1 files changed, 2 insertions, 0 deletions

diff --git a/grep.c b/grep.c
index 475b4ef21..8c6797647 100644
--- a/grep.c
+++ b/grep.c
@@ -232,6 +232,8 @@ extern int grep_main(int argc, char **argv)
                                 before_buf = (char **)calloc(lines_before, sizeof(char *));
                                 break;
 #endif /* BB_FEATURE_GREP_CONTEXT */
+                        default:
+                                show_usage();
                 }
         }