diff --git a/src/libsystemd/sd-json/sd-json.c b/src/libsystemd/sd-json/sd-json.c
index 5e9c1ba15b..c3d74df9e6 100644
--- a/src/libsystemd/sd-json/sd-json.c
+++ b/src/libsystemd/sd-json/sd-json.c
@@ -5614,9 +5614,7 @@ _public_ int sd_json_dispatch_id128(const char *name, sd_json_variant *variant,
 }
 
 _public_ int sd_json_dispatch_signal(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata) {
-        int *signo = userdata;
-        uint32_t k;
-        int r;
+        int *signo = ASSERT_PTR(userdata), r;
 
         assert_return(variant, -EINVAL);
 
@@ -5625,7 +5623,8 @@ _public_ int sd_json_dispatch_signal(const char *name, sd_json_variant *variant,
                 return 0;
         }
 
-        r = sd_json_dispatch_uint32(name, variant, flags, &k);
+        int k;
+        r = sd_json_dispatch_int(name, variant, flags, &k);
         if (r < 0)
                 return r;