diff --git a/Makefile b/Makefile
index 4ebf53f5..ac6241fc 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ GO := GOPROXY=https://proxy.golang.org go
 SOPS_SEC_OPERATOR_VERSION := 0.12.0
 
 # https://github.com/kubernetes-sigs/controller-tools/releases
-CONTROLLER_GEN_VERSION := "v0.13.0"
+CONTROLLER_GEN_VERSION := v0.13.0
 # https://github.com/kubernetes-sigs/controller-runtime/releases
 CONTROLLER_RUNTIME_VERSION := "v0.16.3"
 # https://github.com/kubernetes-sigs/kustomize/releases