diff --git a/Makefile b/Makefile
index 1cce38f..16181bf 100644
--- a/Makefile
+++ b/Makefile
@@ -40,10 +40,8 @@ clean:
 devenv:
 	LD_LIBRARY_PATH=$(PREFIX)/lib \
 	DYLD_LIBRARY_PATH=$(PREFIX)/lib \
-	PYTHONPATH=$PYTHONPATH:`pwd`/build/lib.linux-x86_64-3.7:\
-	PYTHONPATH=$PYTHONPATH:`pwd`/build/lib.macosx-10.9-x86_64-3.8:\
-	`pwd`/src \
+	PYTHONPATH=`pwd`/build/lib.linux-x86_64-3.7:`pwd`/build/lib.macosx-10.9-x86_64-3.8: \
 	bash -l
 
 envtest:
-	python3 -c 'import pEp'
\ No newline at end of file
+	python3 -c 'import pEp'