diff --git a/Makefile b/Makefile
index 3fcebe5..626e1aa 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # Makefile for building and pushing multi-arch Docker images
 
 IMAGE_REPO = git.coopcloud.tech/wiki-cafe/member-console
-DATE_TAG = $(shell date -u +%Y-%m-%dT%HZ-%M)
+DATE_TAG = $(shell date -u +%Y-%m-%dT%H-%MZ)
 PLATFORMS = linux/arm64,linux/amd64
 
 .PHONY: docker-push