diff --git a/Makefile b/Makefile
index aa165080..35bdcb05 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ BINARY := cloudctl-$(GOOS)-$(GOARCH)
 
 SHA := $(shell git rev-parse --short=8 HEAD)
 GITVERSION := $(shell git describe --long --all)
-BUILDDATE := $(shell date --rfc-3339=seconds)
+BUILDDATE := $(shell date --iso-8601=seconds) # this format is parsable with Go RFC3339
 VERSION := $(or ${VERSION},$(shell git describe --tags --exact-match 2> /dev/null || git symbolic-ref -q --short HEAD || git rev-parse --short HEAD))
 
 ifeq ($(CGO_ENABLED),1)