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-rw-r--r--src/compare_hkl.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/compare_hkl.c b/src/compare_hkl.c
index 08f26e5e..c3e7a547 100644
--- a/src/compare_hkl.c
+++ b/src/compare_hkl.c
@@ -771,6 +771,9 @@ int main(int argc, char *argv[])
shell_file = strdup(optarg);
break;
+ case '?' :
+ break;
+
default :
ERROR("Unhandled option '%c'\n", c);
break;