diff --git a/builder/dockerfile.ubuntu_focal.build b/builder/dockerfile.ubuntu_focal.build
index 33fc74a..3571ebc 100644
--- a/builder/dockerfile.ubuntu_focal.build
+++ b/builder/dockerfile.ubuntu_focal.build
@@ -22,8 +22,9 @@ RUN cd /tmp/libwebp-1.0.2 && \
     ./configure --enable-static --disable-shared && \
     make && make install
 
-COPY builder/scripts /scripts
-RUN /scripts/build-libjpeg-turbo
+ENV SCRIPTS_DIR=/tmp/scripts
+COPY builder/scripts $SCRIPTS_DIR
+RUN $SCRIPTS_DIR/build-libjpeg-turbo
 
 RUN useradd -m docker && echo "docker:docker" | chpasswd && adduser docker sudo