diff --git a/src/libsystemd/sd-bus/bus-internal.h b/src/libsystemd/sd-bus/bus-internal.h
index a8d61bf72a..04864d4df0 100644
--- a/src/libsystemd/sd-bus/bus-internal.h
+++ b/src/libsystemd/sd-bus/bus-internal.h
@@ -219,11 +219,11 @@ struct sd_bus {
         size_t rbuffer_size;
 
         sd_bus_message **rqueue;
-        unsigned rqueue_size;
+        size_t rqueue_size;
         size_t rqueue_allocated;
 
         sd_bus_message **wqueue;
-        unsigned wqueue_size;
+        size_t wqueue_size;
         size_t windex;
         size_t wqueue_allocated;
 
diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
index 0df3366d80..f000c6250b 100644
--- a/src/libsystemd/sd-bus/sd-bus.c
+++ b/src/libsystemd/sd-bus/sd-bus.c
@@ -2125,7 +2125,7 @@ _public_ int sd_bus_call(
         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
         usec_t timeout;
         uint64_t cookie;
-        unsigned i;
+        size_t i;
         int r;
 
         bus_assert_return(m, -EINVAL, error);