diff --git a/sys/compat/linuxkpi/common/include/linux/slab.h b/sys/compat/linuxkpi/common/include/linux/slab.h
--- a/sys/compat/linuxkpi/common/include/linux/slab.h
+++ b/sys/compat/linuxkpi/common/include/linux/slab.h
@@ -198,6 +198,12 @@
 	free(__DECONST(void *, ptr), M_KMALLOC);
 }
 
+static __inline void
+kfree_sensitive(const void *ptr)
+{
+	zfree(__DECONST(void *, ptr), M_KMALLOC);
+}
+
 static inline size_t
 ksize(const void *ptr)
 {