diff --git a/.travis.yml b/.travis.yml
index 8642564..e69a138 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ before_install:
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update; fi
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew install nasm; fi
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then alias nasm=/usr/local/bin/nasm; fi
-  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get install libtool autoconf git nasm pkg-config cmake; fi
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then apt-get install libtool autoconf git nasm pkg-config cmake; fi
   - chmod +x install.sh
   - ./install.sh
 
diff --git a/caesium/CMakeLists.txt b/caesium/CMakeLists.txt
index f065199..f608b3c 100644
--- a/caesium/CMakeLists.txt
+++ b/caesium/CMakeLists.txt
@@ -6,6 +6,7 @@ endif ()
 
 find_library(jpeg jpeg ${MOZJPEG_PATH}/lib)
 find_library(turbojpeg turbojpeg ${MOZJPEG_PATH}/lib)
+find_library(zopfli zopfli ${ZOPFLI_PATH}/lib)
 find_library(zopflipng zopflipng ${ZOPFLI_PATH}/lib)
 
 add_library(caesium SHARED caesium.c error.c utils.c png.c vendor/lodepng.c jpeg.c)