diff --git a/src/add-ons/translators/jpegtranslator/Jamfile b/src/add-ons/translators/jpegtranslator/Jamfile
index 7998975de0..3b4affcb9e 100755
--- a/src/add-ons/translators/jpegtranslator/Jamfile
+++ b/src/add-ons/translators/jpegtranslator/Jamfile
@@ -3,6 +3,8 @@ SubDir OBOS_TOP src add-ons translators jpegtranslator ;
 # Let Jam know where to find some of our source files
 SEARCH_SOURCE += [ FDirName $(SUBDIR) libjpeg ] ;
 
+SubDirC++Flags [ FDefines BEOS_R5_COMPATIBLE ] ;
+
 Translator JPEGTranslator :
 
 	# JPEGTranslator
diff --git a/src/prefs/screen/Jamfile b/src/prefs/screen/Jamfile
index dae8e66cb5..0d6ae44096 100644
--- a/src/prefs/screen/Jamfile
+++ b/src/prefs/screen/Jamfile
@@ -1,5 +1,7 @@
 SubDir OBOS_TOP src prefs screen ;
 
+SubDirC++Flags [ FDefines BEOS_R5_COMPATIBLE ] ;
+
 AddResources Screen : Screen.rsrc ;
 
 Preference Screen : AlertView.cpp AlertWindow.cpp RefreshSlider.cpp RefreshView.cpp RefreshWindow.cpp Screen.cpp ScreenDrawView.cpp ScreenSettings.cpp ScreenView.cpp ScreenWindow.cpp Utility.cpp ;