diff --git a/src/libsystemd/sd-journal/journal-file.c b/src/libsystemd/sd-journal/journal-file.c
index 32dd4cfeb80..9db87481f18 100644
--- a/src/libsystemd/sd-journal/journal-file.c
+++ b/src/libsystemd/sd-journal/journal-file.c
@@ -2248,7 +2248,7 @@ int journal_file_append_entry(
                 const dual_timestamp *ts,
                 const sd_id128_t *boot_id,
                 const struct iovec iovec[],
-                unsigned n_iovec,
+                size_t n_iovec,
                 uint64_t *seqnum,
                 Object **ret_object,
                 uint64_t *ret_offset) {
diff --git a/src/libsystemd/sd-journal/journal-file.h b/src/libsystemd/sd-journal/journal-file.h
index a1154a01072..a35aa5daef5 100644
--- a/src/libsystemd/sd-journal/journal-file.h
+++ b/src/libsystemd/sd-journal/journal-file.h
@@ -254,7 +254,8 @@ int journal_file_append_entry(
                 JournalFile *f,
                 const dual_timestamp *ts,
                 const sd_id128_t *boot_id,
-                const struct iovec iovec[], unsigned n_iovec,
+                const struct iovec iovec[],
+                size_t n_iovec,
                 uint64_t *seqno,
                 Object **ret_object,
                 uint64_t *ret_offset);