diff --git a/justfile b/justfile
index ea2f400..ac65e8f 100644
--- a/justfile
+++ b/justfile
@@ -1,3 +1,3 @@
 initialise-template projectname:
-	sed "s/project/{{projectname}}/" ./CMakeLists.txt ./src/CMakeLists.txt
+	sed -i "s/project/{{projectname}}/" ./CMakeLists.txt ./src/CMakeLists.txt
 	mv ./src/project.cpp ./src/{{projectname}}.cpp