diff --git a/Jamrules.common b/Jamrules.common
index 014c6813f9..d354077002 100644
--- a/Jamrules.common
+++ b/Jamrules.common
@@ -116,6 +116,9 @@ actions piecemeal together existing Clean
 {
 	# remove all jam targets
 	$(RM) $(>)
+	# empty bin directory (removing target of other projects)
+    rmdir --ignore-fail-on-non-empty bin/$(BOARD)/$(PROJECT)
+    rmdir --ignore-fail-on-non-empty bin/$(BOARD) 
 }
 
 #
diff --git a/sys/Jamfile b/sys/Jamfile
index 3966421631..5b64399ac2 100644
--- a/sys/Jamfile
+++ b/sys/Jamfile
@@ -30,7 +30,7 @@ SubDir TOP sys ;
 Module swtimer : swtimer.c : hwtimer ;
 Module posix_io : posix_io.c ;
 Module shell : shell.c : hashtable hash_string ;
-Module ps : ps ;
+Module ps : ps.c ;
 
 Module auto_init : auto_init.c ;