diff --git a/Makefile b/Makefile
index 6c06339bb..e97ae48ed 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ DATE        = $(shell date -u +"%Y.%m.%d.%H.%M.%S")
 
 GO_BUILD_VARS= GO111MODULE=on CGO_ENABLED=$(CGO) GOOS=$(TARGET_OS) GOARCH=$(ARCH)
 
-COSIGN_FLAGS ?= -a GIT_HASH=${GIT_COMMIT} -a GIT_VERSION=${VERSION} -a BUILD_DATE=${DATE}
+COSIGN_FLAGS ?= -y -a GIT_HASH=${GIT_COMMIT} -a GIT_VERSION=${VERSION} -a BUILD_DATE=${DATE}
 
 # Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
 ifeq (,$(shell go env GOBIN))