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-rw-r--r--libical/src/libical/icalperiod.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/libical/src/libical/icalperiod.h b/libical/src/libical/icalperiod.h
index 64d53237ad..5f07dd4a88 100644
--- a/libical/src/libical/icalperiod.h
+++ b/libical/src/libical/icalperiod.h
@@ -42,12 +42,12 @@ struct icalperiodtype
struct icalperiodtype icalperiodtype_from_string (const char* str);
const char* icalperiodtype_as_ical_string(struct icalperiodtype p);
-struct icalperiodtype icalperiodtype_null_period();
-int icalperiodtype_is_null_period(struct icalperiodtype p);
-int icalperiodtype_is_valid_period(struct icalperiodtype p);
+struct icalperiodtype icalperiodtype_null_period(void);
+int icalperiodtype_is_null_period(struct icalperiodtype p);
+int icalperiodtype_is_valid_period(struct icalperiodtype p);
#endif /* !ICALTIME_H */