diff --git a/Dockerfile b/Dockerfile
index 1fcad3a..f99cc53 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,8 +7,7 @@ ARG GHC_VERSION
 ARG CABAL_VERSION
 
 LABEL org.opencontainers.image.source=https://github.com/spex-lang/spex
-LABEL org.opencontainers.image.description=
-        "The Spex specification language and toolkit static build image"
+LABEL org.opencontainers.image.description="The Spex specification language and toolkit static build image"
 LABEL org.opencontainers.image.licenses=BSD-2-Clause
 
 # Install system dependencies needed for ghcup.
diff --git a/Makefile b/Makefile
index dfeb76f..4283aa6 100644
--- a/Makefile
+++ b/Makefile
@@ -268,7 +268,7 @@ GITHUB_EVENT_BEFORE =? origin/main
 
 DOCKERFILE_CHANGED := $(shell \
 	git diff --name-only "$(GITHUB_EVENT_AFTER)" "$(GITHUB_EVENT_BEFORE)" \
-	| grep Dockerfile && echo true || echo false)
+	| grep --quiet "^Dockerfile$$" && echo true || echo false)
 
 .PHONY: pull-image build-image push-image
 
@@ -277,9 +277,10 @@ pull-image:
 	  docker pull ghcr.io/spex-lang/spex-build:latest
   endif
 
-build-image: Dockerfile
+build-image: 
+	echo "DOCKERFILE_CHANGED=$(DOCKERFILE_CHANGED)"
   ifeq ($(DOCKERFILE_CHANGED),true)
-	  docker build --tag ghcr.io/spex-lang/spex-build:latest .
+	docker build --tag ghcr.io/spex-lang/spex-build:latest .
   endif
 
 push-image: