diff --git a/include/iscsi-private.h b/include/iscsi-private.h
index dccd8c3..048aa01 100644
--- a/include/iscsi-private.h
+++ b/include/iscsi-private.h
@@ -361,7 +361,7 @@ void iscsi_decrement_iface_rr(void);
 		} \
 	} while (0)
 
-void
+void __attribute__((format(printf, 3, 4)))
 iscsi_log_message(struct iscsi_context *iscsi, int level, const char *format, ...);
 
 void
diff --git a/lib/init.c b/lib/init.c
index 63487de..13098f0 100644
--- a/lib/init.c
+++ b/lib/init.c
@@ -289,7 +289,7 @@ iscsi_create_context(const char *initiator_name)
 	while (iscsi->smalloc_size < required) {
 		iscsi->smalloc_size <<= 1;
 	}
-	ISCSI_LOG(iscsi,5,"small allocation size is %d byte", iscsi->smalloc_size);
+	ISCSI_LOG(iscsi,5,"small allocation size is %lu byte", iscsi->smalloc_size);
 
 	ca = getenv("LIBISCSI_CACHE_ALLOCATIONS");
 	if (!ca || atoi(ca) != 0) {