diff --git a/src/add-ons/kernel/file_cache/rule_based_prefetcher.cpp b/src/add-ons/kernel/file_cache/rule_based_prefetcher.cpp
index 064874fb58..c1c033531b 100644
--- a/src/add-ons/kernel/file_cache/rule_based_prefetcher.cpp
+++ b/src/add-ons/kernel/file_cache/rule_based_prefetcher.cpp
@@ -680,7 +680,7 @@ RuleMatcher::GotArguments(int32 argCount, char * const *args)
 
 
 static void
-node_opened(void *vnode, int32 fdType, mount_id device, vnode_id parent,
+node_opened(struct vnode *vnode, int32 fdType, dev_t device, vnode_id parent,
 	vnode_id node, const char *name, off_t size)
 {
 	if (device < gBootDevice) {