diff --git a/modules/spl/spl-debug.c b/modules/spl/spl-debug.c
index 868be23f1..47d0c854e 100644
--- a/modules/spl/spl-debug.c
+++ b/modules/spl/spl-debug.c
@@ -149,6 +149,14 @@ spl_debug_subsys2str(int subsys)
                 return "taskq";
         case S_KMEM:
                 return "kmem";
+        case S_DEBUG:
+                return "debug";
+        case S_GENERIC:
+                return "generic";
+        case S_PROC:
+                return "proc";
+        case S_MODULE:
+                return "module";
         }
 }