diff --git a/lib/c/criu.h b/lib/c/criu.h
index c32f66418..949902f55 100644
--- a/lib/c/criu.h
+++ b/lib/c/criu.h
@@ -28,6 +28,13 @@
 extern "C" {
 #endif
 
+#define CRIU_LOG_UNSET (-1)
+#define CRIU_LOG_MSG   (0) /* Print message regardless of log level */
+#define CRIU_LOG_ERROR (1) /* Errors only */
+#define CRIU_LOG_WARN  (2) /* Warnings */
+#define CRIU_LOG_INFO  (3) /* Informative */
+#define CRIU_LOG_DEBUG (4) /* Debug only */
+
 enum criu_service_comm { CRIU_COMM_SK, CRIU_COMM_FD, CRIU_COMM_BIN };
 
 enum criu_cg_mode {
diff --git a/test/others/libcriu/test_iters.c b/test/others/libcriu/test_iters.c
index 2a5ca6def..b7e325abb 100644
--- a/test/others/libcriu/test_iters.c
+++ b/test/others/libcriu/test_iters.c
@@ -106,7 +106,7 @@ int main(int argc, char **argv)
 	criu_set_service_binary(argv[1]);
 	criu_set_pid(pid);
 	criu_set_log_file("dump.log");
-	criu_set_log_level(4);
+	criu_set_log_level(CRIU_LOG_DEBUG);
 
 	open_imgdir();
 	ret = criu_dump_iters(next_iter);
@@ -121,7 +121,7 @@ int main(int argc, char **argv)
 
 	printf("--- Restore loop ---\n");
 	criu_init_opts();
-	criu_set_log_level(4);
+	criu_set_log_level(CRIU_LOG_DEBUG);
 	criu_set_log_file("restore.log");
 	criu_set_images_dir_fd(cur_imgdir);
 
diff --git a/test/others/libcriu/test_notify.c b/test/others/libcriu/test_notify.c
index 66fe75338..9a54b812a 100644
--- a/test/others/libcriu/test_notify.c
+++ b/test/others/libcriu/test_notify.c
@@ -71,7 +71,7 @@ int main(int argc, char **argv)
 	criu_set_service_binary(argv[1]);
 	criu_set_pid(pid);
 	criu_set_log_file("dump.log");
-	criu_set_log_level(4);
+	criu_set_log_level(CRIU_LOG_DEBUG);
 	criu_set_notify_cb(notify);
 	fd = open(argv[2], O_DIRECTORY);
 	criu_set_images_dir_fd(fd);
diff --git a/test/others/libcriu/test_self.c b/test/others/libcriu/test_self.c
index 468edc0f7..0a7e63a58 100644
--- a/test/others/libcriu/test_self.c
+++ b/test/others/libcriu/test_self.c
@@ -37,7 +37,7 @@ int main(int argc, char *argv[])
 	}
 
 	criu_set_images_dir_fd(fd);
-	criu_set_log_level(4);
+	criu_set_log_level(CRIU_LOG_DEBUG);
 
 	printf("--- Start child ---\n");
 	pid = fork();
diff --git a/test/others/libcriu/test_sub.c b/test/others/libcriu/test_sub.c
index 41b685847..697abf5d5 100644
--- a/test/others/libcriu/test_sub.c
+++ b/test/others/libcriu/test_sub.c
@@ -69,7 +69,7 @@ int main(int argc, char **argv)
 	criu_set_service_binary(argv[1]);
 	criu_set_pid(pid);
 	criu_set_log_file("dump.log");
-	criu_set_log_level(4);
+	criu_set_log_level(CRIU_LOG_DEBUG);
 	fd = open(argv[2], O_DIRECTORY);
 	criu_set_images_dir_fd(fd);
 
@@ -85,7 +85,7 @@ int main(int argc, char **argv)
 
 	printf("--- Restore loop ---\n");
 	criu_init_opts();
-	criu_set_log_level(4);
+	criu_set_log_level(CRIU_LOG_DEBUG);
 	criu_set_log_file("restore.log");
 	criu_set_images_dir_fd(fd);