diff --git a/shared/missing.h b/shared/missing.h
index 7df6235..0c225a2 100644
--- a/shared/missing.h
+++ b/shared/missing.h
@@ -20,6 +20,7 @@
 #endif
 
 #ifndef __NR_finit_module
+# warning __NR_finit_module missing - kmod might not work correctly
 # define __NR_finit_module -1
 #endif