diff --git a/src/add-ons/kernel/file_systems/ramfs/Jamfile b/src/add-ons/kernel/file_systems/ramfs/Jamfile
index 4357dc1926..5c40a3488f 100644
--- a/src/add-ons/kernel/file_systems/ramfs/Jamfile
+++ b/src/add-ons/kernel/file_systems/ramfs/Jamfile
@@ -8,6 +8,8 @@ SubDirHdrs [ FDirName $(userlandFSIncludes) shared ] ;
 
 SEARCH_SOURCE += [ FDirName $(userlandFSTop) shared ] ;
 
+DEFINES += DEBUG_APP="\\\"ramfs\\\"" ;
+
 KernelAddon ramfs
 	: Debug.cpp
 	  Locker.cpp
diff --git a/src/add-ons/kernel/file_systems/reiserfs/Jamfile b/src/add-ons/kernel/file_systems/reiserfs/Jamfile
index 7bc22cfd0c..f6fe9e892d 100644
--- a/src/add-ons/kernel/file_systems/reiserfs/Jamfile
+++ b/src/add-ons/kernel/file_systems/reiserfs/Jamfile
@@ -8,6 +8,8 @@ SubDirHdrs [ FDirName $(userlandFSIncludes) shared ] ;
 
 SEARCH_SOURCE += [ FDirName $(userlandFSTop) shared ] ;
 
+DEFINES += DEBUG_APP="\\\"reiserfs\\\"" ;
+
 KernelAddon reiserfs
 	: 
 	Debug.cpp