diff --git a/packaging/lin/Dockerfile b/packaging/lin/Dockerfile
index 89f6a40f..0f0fb835 100644
--- a/packaging/lin/Dockerfile
+++ b/packaging/lin/Dockerfile
@@ -2,7 +2,7 @@ FROM debian:wheezy
 MAINTAINER Lovell Fuller <npm@lovell.info>
 
 # Build dependencies
-RUN apt-get update && apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo
+RUN apt-get update && apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo advancecomp
 
 # Create working directories
 ENV DEPS=/deps \
@@ -218,4 +218,5 @@ RUN echo "{\n\
 
 # Create .tar.gz
 WORKDIR ${TARGET}
-RUN GZIP=-9 tar czf /libvips-${VERSION_VIPS}-lin.tar.gz include lib
+RUN tar czf /libvips-${VERSION_VIPS}-lin.tar.gz include lib
+RUN advdef --recompress --shrink-insane /libvips-${VERSION_VIPS}-lin.tar.gz
diff --git a/packaging/win/Dockerfile b/packaging/win/Dockerfile
index 9b046559..1b913338 100644
--- a/packaging/win/Dockerfile
+++ b/packaging/win/Dockerfile
@@ -1,7 +1,7 @@
 FROM debian:wheezy
 MAINTAINER Lovell Fuller <npm@lovell.info>
 
-RUN apt-get update && apt-get install -y curl zip
+RUN apt-get update && apt-get install -y curl zip advancecomp
 
 ENV VERSION_VIPS=8.3.1
 
@@ -17,4 +17,5 @@ RUN rm bin/libvipsCC-42.dll bin/libvips-cpp-42.dll bin/libgsf-win32-1-114.dll
 RUN cp bin/*.dll lib/
 RUN cp -r lib64/* lib/
 
-RUN GZIP=-9 tar czf /libvips-${VERSION_VIPS}-win.tar.gz include lib/glib-2.0 lib/libvips.lib lib/libglib-2.0.lib lib/libgobject-2.0.lib lib/*.dll
+RUN tar czf /libvips-${VERSION_VIPS}-win.tar.gz include lib/glib-2.0 lib/libvips.lib lib/libglib-2.0.lib lib/libgobject-2.0.lib lib/*.dll
+RUN advdef --recompress --shrink-insane /libvips-${VERSION_VIPS}-win.tar.gz