diff --git a/src/fuzz/fuzz-calendarspec.c b/src/fuzz/fuzz-calendarspec.c
index 80801723fd..07d3fbca7f 100644
--- a/src/fuzz/fuzz-calendarspec.c
+++ b/src/fuzz/fuzz-calendarspec.c
@@ -16,7 +16,6 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
         if (calendar_spec_from_string(str, &cspec) >= 0) {
                 (void) calendar_spec_valid(cspec);
-                (void) calendar_spec_normalize(cspec);
                 (void) calendar_spec_to_string(cspec, &p);
         }
 
diff --git a/src/shared/calendarspec.c b/src/shared/calendarspec.c
index 7dfb50b98d..369cb2f081 100644
--- a/src/shared/calendarspec.c
+++ b/src/shared/calendarspec.c
@@ -145,7 +145,7 @@ static void fix_year(CalendarComponent *c) {
         }
 }
 
-int calendar_spec_normalize(CalendarSpec *c) {
+static void calendar_spec_normalize(CalendarSpec *c) {
         assert(c);
 
         if (streq_ptr(c->timezone, "UTC")) {
@@ -167,8 +167,6 @@ int calendar_spec_normalize(CalendarSpec *c) {
         normalize_chain(&c->hour);
         normalize_chain(&c->minute);
         normalize_chain(&c->microsecond);
-
-        return 0;
 }
 
 static bool chain_valid(CalendarComponent *c, int from, int to, bool end_of_month) {
@@ -1086,9 +1084,7 @@ int calendar_spec_from_string(const char *p, CalendarSpec **spec) {
                         return -EINVAL;
         }
 
-        r = calendar_spec_normalize(c);
-        if (r < 0)
-                return r;
+        calendar_spec_normalize(c);
 
         if (!calendar_spec_valid(c))
                 return -EINVAL;
diff --git a/src/shared/calendarspec.h b/src/shared/calendarspec.h
index 3bfe82d7f6..d756efcdb7 100644
--- a/src/shared/calendarspec.h
+++ b/src/shared/calendarspec.h
@@ -35,7 +35,6 @@ typedef struct CalendarSpec {
 
 CalendarSpec* calendar_spec_free(CalendarSpec *c);
 
-int calendar_spec_normalize(CalendarSpec *spec);
 bool calendar_spec_valid(CalendarSpec *spec);
 
 int calendar_spec_to_string(const CalendarSpec *spec, char **p);