diff --git a/.drone.yml b/.drone.yml
index 2607e25..be0eae9 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -11,3 +11,30 @@ steps:
   image: julia:1.5
   commands:
   - "julia --project=. --check-bounds=yes --color=yes -e 'using InteractiveUtils; versioninfo(verbose=true); using Pkg; Pkg.build(); Pkg.test(coverage=true)'"
+
+---
+kind: pipeline
+name: linux - arm - Julia 1.6
+platform:
+  os: linux
+  arch: arm
+
+steps:
+- name: build
+  image: julia:1.6
+  commands:
+  - "julia --project=. --check-bounds=yes --color=yes -e 'using InteractiveUtils; versioninfo(verbose=true); using Pkg; Pkg.build(); Pkg.test(coverage=true)'"
+
+---
+kind: pipeline
+name: linux - arm64 - Julia 1.6
+
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+- name: build
+  image: julia:1.6
+  commands:
+  - "julia --project=. --check-bounds=yes --color=yes -e 'using InteractiveUtils; versioninfo(verbose=true); using Pkg; Pkg.build(); Pkg.test(coverage=true)'"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..65063c3
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,42 @@
+name: CI
+on:
+  - push
+  - pull_request
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.5'
+          - 'nightly'
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+        arch:
+          - x64
+          - x86
+        exclude:
+          - os: macOS-latest
+            arch: x86
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: actions/cache@v1
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-
+            ${{ runner.os }}-
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
diff --git a/Project.toml b/Project.toml
index 0af4980..b209a69 100644
--- a/Project.toml
+++ b/Project.toml
@@ -4,7 +4,7 @@ authors  = ["ScottPJones <scottjones@alum.mit.edu>"]
 keywords = ["Strings"]
 license  = "MIT"
 uuid     = "e79e7a6a-7bb1-5a4d-9d64-da657b06f53a"
-version = "1.0.5"
+version = "1.1.0"
 
 [deps]
 Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
diff --git a/src/utf8.jl b/src/utf8.jl
index 71b07b1..4300d27 100644
--- a/src/utf8.jl
+++ b/src/utf8.jl
@@ -213,7 +213,7 @@ is_ascii(str::SubString{<:Str{C}}) where {C<:ASCII_Union} =
 
 is_ascii(vec::Vector{T}) where {T<:CodeUnitTypes} =
     (cnt = sizeof(vec)) == 0 ||
-         (@preserve str _check_mask_ul(pointer(vec), cnt, _ascii_mask(T)))
+         (@preserve vec _check_mask_ul(pointer(vec), cnt, _ascii_mask(T)))
 
 is_ascii(str::Str{C}) where {C<:ASCII_Union} =
     (cnt = sizeof(str)) == 0 ||