diff --git a/.travis.yml b/.travis.yml
index 7867df4..fccb757 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,14 @@ sudo: required
 
 matrix:
   include:
+    - os: linux
+      compiler: gcc
+      env: COMPILER=g++-5
+      addons:
+        apt:
+          sources: ['ubuntu-toolchain-r-test']
+          packages: g++-5
+
     - os: linux
       compiler: gcc
       env: COMPILER=g++-6
@@ -11,6 +19,7 @@ matrix:
         apt:
           sources: ['ubuntu-toolchain-r-test']
           packages: g++-6
+
     - os: linux
       compiler: gcc
       env:
@@ -22,6 +31,7 @@ matrix:
           packages:
             - g++-7
             - doxygen
+
     - os: linux
       compiler: gcc
       env:
@@ -41,6 +51,14 @@ matrix:
           sources: ubuntu-toolchain-r-test
           packages: g++-8
 
+    - os: linux
+      compiler: clang
+      env: COMPILER=clang++-5.0
+      addons:
+        apt:
+          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
+          packages: ['clang-5.0', 'libstdc++-7-dev']
+
     - os: linux
       compiler: clang
       env: COMPILER=clang++-6.0
diff --git a/README.md b/README.md
index cc91438..a6913ae 100644
--- a/README.md
+++ b/README.md
@@ -262,8 +262,8 @@ render("Hello{# Todo #}!", data); // "Hello!"
 
 ## Supported compilers
 
-Inja uses `string_view` from C++17, everything else should work with C++11. Currently, the following compilers are tested:
+Inja uses `string_view` from C++17, but includes the [polyfill](https://github.com/martinmoene/string-view-lite) from martinmoene. This way, the minimum version is C++11. Currently, the following compilers are tested:
 
-- GCC 7.0 - 8.0 (and possibly later)
-- Clang 6.0 (and possibly later)
-- Microsoft Visual C++ 2017 / Build Tools 15.1.548.43366 (and possibly later)
+- GCC 5.0 - 8.0 (and possibly later)
+- Clang 5.0 - 6.0 (and possibly later)
+- Microsoft Visual C++ 2015 - 2017 (and possibly later)
diff --git a/appveyor.yml b/appveyor.yml
index 4ca4074..90bf78f 100755
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -2,6 +2,11 @@ version: '{build}'
 
 environment:
   matrix:
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      platform: x64
+      FLAGS: "/permissive- /utf-8 /Zc:__cplusplus"
+      GENERATOR: Visual Studio 14 2015
+
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       platform: x64
       FLAGS: "/permissive- /std:c++17 /utf-8 /Zc:__cplusplus"