diff --git a/cs656/lab4/Makefile b/cs656/lab4/Makefile
index d1abcd8..8293f5a 100644
--- a/cs656/lab4/Makefile
+++ b/cs656/lab4/Makefile
@@ -3,7 +3,8 @@ RESTLET_DIR := $(HOME)/restlet/lib
 nullstring :=
 space := $(nullstring) #
 RESTLET_JARS := $(subst $(space),:,$(shell find $(RESTLET_DIR) -iname '*.jar'))
-export CLASSPATH += $(RESTLET_JARS)
+NEWCLASSPATH := $(CLASSPATH):$(RESTLET_JARS)
+export CLASSPATH := $(NEWCLASSPATH)
 
 all:
 	javac *.java