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-rw-r--r--libcrystfel/src/events.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/events.h b/libcrystfel/src/events.h
index ff4cf1fb..8cb00962 100644
--- a/libcrystfel/src/events.h
+++ b/libcrystfel/src/events.h
@@ -75,7 +75,7 @@ extern int pop_dim_entry_from_event(struct event *ev);
extern struct event *copy_event(struct event *ev);
extern void free_event(struct event *ev);
extern char *get_event_string(struct event *ev);
-extern struct event *get_event_from_event_string(char *ev_string);
+extern struct event *get_event_from_event_string(const char *ev_string);
extern char *event_path_placeholder_subst(const char *ev_name,
const char *data);
extern char *partial_event_substitution(struct event *ev, const char *data);