diff --git a/.github/workflows/crystal.yml b/.github/workflows/crystal.yml
index 23f382d..4c06b3f 100644
--- a/.github/workflows/crystal.yml
+++ b/.github/workflows/crystal.yml
@@ -18,10 +18,18 @@ jobs:
         run: crystal tool format --check
 
   test:
-    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { os: ubuntu-latest }
+          - { os: windows-latest }
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Install Crystal
         uses: crystal-lang/install-crystal@v1
+        with:
+          crystal: ${{ matrix.crystal }}
       - name: Check out repository code
         uses: actions/checkout@v4
       - name: Install dependencies
diff --git a/src/ipapi.cr b/src/ipapi.cr
index 3d800da..3422c86 100644
--- a/src/ipapi.cr
+++ b/src/ipapi.cr
@@ -38,7 +38,7 @@ module Ipapi
     # Retrive the location of a specific IP address.
     # If `ip_address` is `nil`, use the client's IP.
     def locate(ip_address : String? = nil) : Location?
-      url = Path.new([API_URL, ip_address, "json"].compact).to_s
+      url = Path.posix([API_URL, ip_address, "json"].compact).to_s
       url = url + "?key=#{@api_key}" if @api_key
 
       response = HTTP::Client.get(url)
@@ -50,7 +50,7 @@ module Ipapi
       # Retrive {{description.id}} of a specific IP address.
       # If `ip_address` is `nil`, use the client's IP.
       def {{field.id}}(ip_address : String? = nil) : String
-        url = Path.new([API_URL, ip_address, "{{field.id}}"].compact).to_s
+        url = Path.posix([API_URL, ip_address, "{{field.id}}"].compact).to_s
 
         url = url + "?key=#{@api_key}" if @api_key