diff --git a/src/resolve/resolved-etc-hosts.c b/src/resolve/resolved-etc-hosts.c
index 5eee9c57b2..6acae48c2b 100644
--- a/src/resolve/resolved-etc-hosts.c
+++ b/src/resolve/resolved-etc-hosts.c
@@ -285,6 +285,8 @@ int etc_hosts_parse(EtcHosts *hosts, FILE *f) {
         unsigned nr = 0;
         int r;
 
+        assert(hosts);
+
         for (;;) {
                 _cleanup_free_ char *line = NULL;
                 char *l;
diff --git a/src/shared/cpu-set-util.c b/src/shared/cpu-set-util.c
index 580aa27c5c..d096576cd6 100644
--- a/src/shared/cpu-set-util.c
+++ b/src/shared/cpu-set-util.c
@@ -145,6 +145,8 @@ int parse_cpu_set_full(
         _cleanup_(cpu_set_reset) CPUSet c = {};
         const char *p = ASSERT_PTR(rvalue);
 
+        assert(cpu_set);
+
         for (;;) {
                 _cleanup_free_ char *word = NULL;
                 unsigned cpu_lower, cpu_upper;
@@ -198,6 +200,8 @@ int parse_cpu_set_extend(
         _cleanup_(cpu_set_reset) CPUSet cpuset = {};
         int r;
 
+        assert(old);
+
         r = parse_cpu_set_full(rvalue, &cpuset, true, unit, filename, line, lvalue);
         if (r < 0)
                 return r;