diff --git a/.travis.yml b/.travis.yml
index b2ad9d5b7e5..3f7c856a7f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -45,7 +45,7 @@ matrix:
     - os: linux
       env: BASE_TESTS=true
     - os: windows
-      env: CARGO_INCREMENTAL=0 BASE_TESTS=true
+      env: CARGO_INCREMENTAL=0 BASE_TESTS=true OS_WINDOWS=true
 
     # Builds that are only executed when a PR is r+ed or a try build is started
     # We don't want to run these always because they go towards
diff --git a/ci/base-tests.sh b/ci/base-tests.sh
index 34bc9a8eca2..a53a0ea52be 100755
--- a/ci/base-tests.sh
+++ b/ci/base-tests.sh
@@ -31,11 +31,16 @@ export CARGO_TARGET_DIR=`pwd`/target/
   sysroot=$(./target/debug/clippy-driver --print sysroot)
   test $sysroot = $(rustc --print sysroot)
 
-  sysroot=$(./target/debug/clippy-driver --sysroot /tmp --print sysroot)
-  test $sysroot = /tmp
+  if [ -z $OS_WINDOWS ]; then
+    desired_sysroot=/tmp
+  else
+    desired_sysroot=C:/tmp
+  fi
+  sysroot=$(./target/debug/clippy-driver --sysroot $desired_sysroot --print sysroot)
+  test $sysroot = $desired_sysroot
 
-  sysroot=$(SYSROOT=/tmp ./target/debug/clippy-driver --print sysroot)
-  test $sysroot = /tmp
+  sysroot=$(SYSROOT=$desired_sysroot ./target/debug/clippy-driver --print sysroot)
+  test $sysroot = $desired_sysroot
 
   # Make sure this isn't set - clippy-driver should cope without it
   unset CARGO_MANIFEST_DIR