diff --git a/docker/Dockerfile b/docker/Dockerfile
index fb78274..8f3f159 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -31,6 +31,7 @@ RUN echo "## Install Emscripten" \
 RUN cd ${EMSDK} \
     && echo "## Generate standard configuration" \
     && ./emsdk activate ${EMSCRIPTEN_VERSION} \
+    && chmod 777 ${EMSDK}/upstream/emscripten \
     && chmod -R 777 ${EMSDK}/upstream/emscripten/cache \
     && cat ${EMSDK}/upstream/emscripten/cache/sanity.txt \
     && echo "## Done"
@@ -86,6 +87,7 @@ RUN echo "## Update and install packages" \
     && mkdir -p /usr/share/man/man1/ \
     && apt-get -qq -y update \
     && apt-get -qq install -y --no-install-recommends \
+        sudo \
         libxml2 \
         ca-certificates \
         python3 \
diff --git a/docker/test_dockerimage.sh b/docker/test_dockerimage.sh
index 901ee92..9c8b92b 100755
--- a/docker/test_dockerimage.sh
+++ b/docker/test_dockerimage.sh
@@ -1,6 +1,8 @@
 #!/bin/bash
 set -ex
 
+sudo -u nobody `which emcc` --version
+
 which asm2wasm
 which llvm-ar
 which emsdk