diff --git a/Jamrules b/Jamrules
index 82e1d9fe64..4d3336294f 100644
--- a/Jamrules
+++ b/Jamrules
@@ -349,9 +349,9 @@ rule Addon
 	LINKFLAGS on $(1) += -nostart -Xlinker -soname=\"$(1)\" ;
 }
 
-rule KernelAddon
+rule R5KernelAddon
 {
-	# KernelAddon <name> : <relpath> : <sources> ;	
+	# R5KernelAddon <name> : <relpath> : <sources> ;	
 
 	local sources = $(3) ;
 
diff --git a/src/add-ons/kernel/file_systems/befs/Jamfile b/src/add-ons/kernel/file_systems/befs/Jamfile
index 677f10f7e4..3c0116e04f 100644
--- a/src/add-ons/kernel/file_systems/befs/Jamfile
+++ b/src/add-ons/kernel/file_systems/befs/Jamfile
@@ -7,7 +7,7 @@ SubDir OBOS_TOP src add-ons kernel file_systems befs ;
 	SubDirC++Flags $(defines) $(debug) ;
 }
 
-KernelAddon obfs : [ FDirName kernel file_systems befs ] :
+R5KernelAddon obfs : [ FDirName kernel file_systems befs ] :
 	BlockAllocator.cpp
 	BPlusTree.cpp
 	cpp.cpp