diff --git a/sc2/build/unix_installer/install.sh.in b/sc2/build/unix_installer/install.sh.in
index 733495f72..475986f0b 100644
--- a/sc2/build/unix_installer/install.sh.in
+++ b/sc2/build/unix_installer/install.sh.in
@@ -194,10 +194,10 @@ mkdir -p -- "$INSTALL_BASE"/lib/uqm 2> /dev/null
 mkdir -p -- "$INSTALL_BASE"/bin 2> /dev/null
 
 echo "Unpacking content..."
-gzip -dc "$CONTENT_FILE" | tar -xzf - -C "$INSTALL_BASE"lib/uqm
+gzip -dc "$CONTENT_FILE" | tar -xf - -C "$INSTALL_BASE"lib/uqm
 
 echo "Unpacking other stuff..."
-tail -c @ATTACHLEN@ < "$0" | tar -xzf - -C "$INSTALL_BASE"lib/
+tail -c @ATTACHLEN@ < "$0" | gzip -dc | tar -xf - -C "$INSTALL_BASE"lib/
 
 echo "Creating wrapper script..."
 cat << EOF > "$INSTALL_BASE"bin/uqm