diff --git a/GNUmakefile b/GNUmakefile
index 1325e488c..58b72dfac 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -18,7 +18,7 @@ GOTEST_PKGS=$(shell go list ./... | sed 's/github.com\/hashicorp\/nomad/./' | eg
 endif
 
 # tag corresponding to latest release we maintain backward compatibility with
-PROTO_COMPARE_TAG ?= v1.0.0$(if $(findstring ent,$(GO_TAGS)),+ent,)
+PROTO_COMPARE_TAG ?= v1.0.3$(if $(findstring ent,$(GO_TAGS)),+ent,)
 
 default: help