diff --git a/Backend/Sandbox/Asm/Dockerfile b/Backend/Sandbox/Asm/Dockerfile
index f4b284d..dc065f9 100644
--- a/Backend/Sandbox/Asm/Dockerfile
+++ b/Backend/Sandbox/Asm/Dockerfile
@@ -21,7 +21,7 @@ COPY Backend/Sandbox/Asm Backend/Sandbox/Asm
 RUN dotnet publish Backend/Sandbox/Asm/Asm.csproj -c Release -o /app
 
 # 'docker buildx use default' is needed to use local 'ghcr.io/kubaz2/sharp/checked-runtime' image
-FROM --platform=$BUILDPLATFORM ghcr.io/kubaz2/sharp/checked-runtime:$DOTNET_RUNTIME_VERSION AS checked-runtime
+FROM ghcr.io/kubaz2/sharp/checked-runtime:$DOTNET_RUNTIME_VERSION AS checked-runtime
 
 FROM mcr.microsoft.com/dotnet/runtime:$DOTNET_RUNTIME_VERSION-$OS_CODENAME AS runtime
 ARG DOTNET_RUNTIME_VERSION
diff --git a/Backend/Sandbox/CheckedRuntime/Dockerfile b/Backend/Sandbox/CheckedRuntime/Dockerfile
index 2b2c156..35d81b8 100644
--- a/Backend/Sandbox/CheckedRuntime/Dockerfile
+++ b/Backend/Sandbox/CheckedRuntime/Dockerfile
@@ -33,6 +33,6 @@ RUN if [ $TARGETARCH = $BUILDARCH ]; then \
         ROOTFS_DIR=/runtime/.tools/rootfs/$DOTNET_ARCH ./build.sh clr -c Checked -a $DOTNET_ARCH --cross; \
     fi
 
-FROM --platform=$BUILDPLATFORM busybox:latest AS storage
+FROM scratch AS storage
 
 COPY --from=build-env /runtime/artifacts/bin/coreclr/linux.*.*/libclrjit.so /runtime/libclrjit.so