diff --git a/services/storage/artifacts.mk b/services/storage/artifacts.mk
index b78c71a..018b9d9 100644
--- a/services/storage/artifacts.mk
+++ b/services/storage/artifacts.mk
@@ -2,7 +2,7 @@
 
 CURRENT_DIR=$(dir $(abspath $(lastword $(MAKEFILE_LIST))))
 STORAGE_DIR=$(patsubst %/,%,$(CURRENT_DIR))
-SSL_CONFIG := $(shell mktemp)
+SSL_CONFIG=$(shell mktemp)
 
 get.storage:
 	@echo "⇒ Creating TLS certs to NeoFS node"