diff --git a/.travis.yml b/.travis.yml
index 7d04f2ef6..f4d4c1c77 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -45,8 +45,8 @@ matrix:
           env:
             - BUILD_PL=true
             - SLIC3R_STATIC=1
-            - CC=gcc-4.9
-            - CXX=g++-4.9
+            - CC=gcc-7
+            - CXX=g++-7
           install:
             - export BOOST_DIR=$HOME/boost_1_63_0
             - export SLIC3R_STATIC=1
@@ -61,7 +61,7 @@ matrix:
             - package/deploy/sftp-symlink.sh linux ~/slic3r-upload.rsa AppImage Slic3r*.AppImage
             - package/deploy/sftp-symlink.sh linux ~/slic3r-upload.rsa tar.bz2 *.bz2
         - os: linux
-            env: 
+          env: 
             - WXVERSION=pkg
             - CC=gcc-7
             - CXX=g++-7
@@ -70,7 +70,7 @@ matrix:
           cache:
             apt: true
             directories:
-            - "$HOME/cache"
+              - "$HOME/cache"
           after_success:
             - cp slic3r ../
             - LD_LIBRARY_PATH=$WXDIR/lib package/linux/make_archive.sh linux-x64