diff --git a/src/plugins/task/cgroup/task_cgroup.h b/src/plugins/task/cgroup/task_cgroup.h
index bc4d20115951e84ce360847924fa8df82501d434..8653776afecaf2f24706cdbfe4366cd582733d0a 100644
--- a/src/plugins/task/cgroup/task_cgroup.h
+++ b/src/plugins/task/cgroup/task_cgroup.h
@@ -43,6 +43,8 @@
 
 #include "src/slurmd/common/xcgroup.h"
 
+int val_to_char(int v);
+
 extern char* task_cgroup_create_slurm_cg (xcgroup_ns_t* ns);
 
 #endif