diff --git a/.github/workflows/proto.yml b/.github/workflows/proto.yml
index 503bed0c43cd..bdc2cdbda5cb 100644
--- a/.github/workflows/proto.yml
+++ b/.github/workflows/proto.yml
@@ -26,5 +26,5 @@ jobs:
           PATTERNS: |
             **/**.proto
       - name: check-breakage
-        run: make proto-check-breaking
+        run: make proto-check-breaking PR_TARGET_REPO=https://github.com/${{ github.repository }}.git PR_TARGET_BRANCH=${{ github.base_ref }}
         if: env.GIT_DIFF
diff --git a/Makefile b/Makefile
index d3a653d50250..f6f5be9ac81d 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,8 @@ BINDIR ?= $(GOPATH)/bin
 BUILDDIR ?= $(CURDIR)/build
 SIMAPP = ./simapp
 MOCKS_DIR = $(CURDIR)/tests/mocks
-HTTPS_GIT := https://github.com/cosmos/cosmos-sdk.git
+PR_TARGET_REPO = https://github.com/cosmos/cosmos-sdk.git
+PR_TARGET_BRANCH = master
 DOCKER := $(shell which docker)
 DOCKER_BUF := $(DOCKER) run --rm -v $(CURDIR):/workspace --workdir /workspace bufbuild/buf
 
@@ -415,7 +416,7 @@ proto-lint:
 	@$(DOCKER_BUF) lint --error-format=json
 
 proto-check-breaking:
-	@$(DOCKER_BUF) breaking --against $(HTTPS_GIT)#branch=master
+	@$(DOCKER_BUF) breaking --against $(PR_TARGET_REPO)#branch=$(PR_TARGET_BRANCH)
 
 
 TM_URL              = https://raw.githubusercontent.com/tendermint/tendermint/v0.34.0-rc6/proto/tendermint