diff --git a/src/apps/diskprobe/Jamfile b/src/apps/diskprobe/Jamfile
index a3bcd3cf21..fe993b4b22 100644
--- a/src/apps/diskprobe/Jamfile
+++ b/src/apps/diskprobe/Jamfile
@@ -4,18 +4,6 @@ UsePrivateHeaders shared ;
 
 AddResources DiskProbe : DiskProbe.rdef ;
 
-# set some additional defines for R5 compatibility
-{
-	local defines = ;
-
-	if $(COMPILE_FOR_R5) {
-		defines += COMPILE_FOR_R5 ;
-	}
-
-	defines = [ FDefines $(defines) ] ;
-	SubDirC++Flags $(defines) -Wall -Wno-multichar ;
-}
-
 App DiskProbe :
 	DiskProbe.cpp
 	DataEditor.cpp