diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 24df03c6..b80afedf 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -59,7 +59,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
-          build-args: FLAGS="-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}"
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: monolith
           platforms: ${{ env.PLATFORMS }}
           push: true
@@ -87,7 +87,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
-          build-args: FLAGS="-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}"
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: monolith
           platforms: ${{ env.PLATFORMS }}
           push: true
@@ -138,7 +138,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
-          build-args: FLAGS="-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}"
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: polylith
           platforms: ${{ env.PLATFORMS }}
           push: true
@@ -166,6 +166,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: polylith
           platforms: ${{ env.PLATFORMS }}
           push: true
@@ -216,6 +217,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: demo-pinecone
           platforms: ${{ env.PLATFORMS }}
           push: true
@@ -231,7 +233,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
-          build-args: FLAGS="-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}"
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: demo-pinecone
           platforms: ${{ env.PLATFORMS }}
           push: true
@@ -282,6 +284,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: demo-yggdrasil
           platforms: ${{ env.PLATFORMS }}
           push: true
@@ -297,7 +300,7 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
-          build-args: FLAGS="-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}"
+          build-args: FLAGS=-X github.com/matrix-org/dendrite/internal.branch=${{ env.BRANCH }} -X github.com/matrix-org/dendrite/internal.build=${{ env.BUILD }}
           target: demo-yggdrasil
           platforms: ${{ env.PLATFORMS }}
           push: true
diff --git a/Dockerfile b/Dockerfile
index c32d693e..007d985b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ RUN apk --update --no-cache add bash build-base curl
 #
 # build creates all needed binaries
 #
-FROM base AS build
+FROM --platform=${BUILDPLATFORM} base AS build
 WORKDIR /src
 ARG TARGETOS
 ARG TARGETARCH