diff --git a/Makefile b/Makefile
index 8faf2019aa3c..9a8ca9fa34e1 100644
--- a/Makefile
+++ b/Makefile
@@ -239,7 +239,7 @@ setup-config-prompts:
 		 read -p "Enter a password for the sandbox container: " ssh_password; \
 		 echo "ssh_password=\"$$ssh_password\"" >> $(CONFIG_FILE).tmp; \
 	 else \
-		echo "persist_sandbox=\"$$persist_sandbox\"" >> $(CONFIG_FILE).tmp
+		echo "persist_sandbox=\"$$persist_sandbox\"" >> $(CONFIG_FILE).tmp; \
 	 fi
 
 	@echo "" >> $(CONFIG_FILE).tmp