diff --git a/prism-examples/phil_lss/phil_lss3.nm b/prism-examples/phil_lss/phil_lss3.nm
index 8365c802..a555dd15 100644
--- a/prism-examples/phil_lss/phil_lss3.nm
+++ b/prism-examples/phil_lss/phil_lss3.nm
@@ -57,7 +57,7 @@ endmodule
 // atomic formule 
 // left fork and right fork free resp.
 formula lfree = p2>=0&p2<=4|p2=6|p2=11|p2=13;
-formula rfree = p2>=0&p2<=3|p2=5|p2=7|p2=12|p2=13;
+formula rfree = p3>=0&p3<=3|p3=5|p3=7|p3=12|p3=13;
 
 module phil1
 
diff --git a/prism-examples/phil_lss/phil_lss4.nm b/prism-examples/phil_lss/phil_lss4.nm
index cc0e4fcd..fb61207b 100644
--- a/prism-examples/phil_lss/phil_lss4.nm
+++ b/prism-examples/phil_lss/phil_lss4.nm
@@ -84,7 +84,7 @@ endmodule
 // atomic formule 
 // left fork and right fork free resp.
 formula lfree = p2>=0&p2<=4|p2=6|p2=11|p2=13;
-formula rfree = p2>=0&p2<=3|p2=5|p2=7|p2=12|p2=13;
+formula rfree = p3>=0&p3<=3|p3=5|p3=7|p3=12|p3=13;
 
 module phil1