diff --git a/.travis.yml b/.travis.yml
index 0e5a9df350..f91ad297a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,14 +58,11 @@ script:
  # Use the more recent compilers we just installed
  - if [ "$TRAVIS_OS_NAME" == "linux" ] && [ "$CXX" == "clang++" ]; then export CXX="clang++-5.0" CC="clang-5.0"; fi
 
- # Build the Vulkan backend on Linux
- - if [ "$TRAVIS_OS_NAME" == "linux" ]; then export BUILD_VULKAN=1; else export BUILD_VULKAN=0; fi
-
  # Build
  - mkdir -p build
  - cd build
  - cmake --version
- - cmake -G "Ninja" -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DDAWN_USE_WERROR=1 -DDAWN_ENABLE_VULKAN=$BUILD_VULKAN ..
+ - cmake -G "Ninja" -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DDAWN_USE_WERROR=1 ..
  - cmake --build .
 
  # Test
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c62310288..513ce07202 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,17 +40,24 @@ option(DAWN_USE_WERROR "Treat warnings as error (useful for CI)" 0)
 # Default values for the backend-enabling options
 set(ENABLE_D3D12 OFF)
 set(ENABLE_METAL OFF)
+set(ENABLE_OPENGL OFF)
+set(ENABLE_VULKAN OFF)
 if (WIN32)
     set(ENABLE_D3D12 ON)
+    set(ENABLE_OPENGL ON)
+    set(ENABLE_VULKAN ON)
 elseif(APPLE)
     set(ENABLE_METAL ON)
+elseif(UNIX)
+    set(ENABLE_OPENGL ON)
+    set(ENABLE_VULKAN ON)
 endif()
 
 option(DAWN_ENABLE_D3D12 "Enable compilation of the D3D12 backend" ${ENABLE_D3D12})
 option(DAWN_ENABLE_METAL "Enable compilation of the Metal backend" ${ENABLE_METAL})
 option(DAWN_ENABLE_NULL "Enable compilation of the Null backend" ON)
-option(DAWN_ENABLE_OPENGL "Enable compilation of the OpenGL backend" ON)
-option(DAWN_ENABLE_VULKAN "Enable compilation of the Vulkan backend" OFF)
+option(DAWN_ENABLE_OPENGL "Enable compilation of the OpenGL backend" ${ENABLE_OPENGL})
+option(DAWN_ENABLE_VULKAN "Enable compilation of the Vulkan backend" ${ENABLE_VULKAN})
 option(DAWN_ALWAYS_ASSERT "Enable assertions on all build types" OFF)
 option(DAWN_USE_CPP17 "Use some optional C++17 features for compile-time checks" OFF)