diff --git a/.github/workflows/win.yml b/.github/workflows/win.yml
index c2016ce612fa..133a469034ef 100644
--- a/.github/workflows/win.yml
+++ b/.github/workflows/win.yml
@@ -44,6 +44,7 @@ jobs:
             libs/pcre.lib
             libs/iconv.lib
             libs/gc.lib
+            libs/ffi.lib
             libs/z.lib
             libs/mpir.lib
             libs/yaml.lib
@@ -110,6 +111,37 @@ jobs:
           </Project>' > 'Override.props'
 
           MSBuild.exe /p:Platform=x64 /p:Configuration=ReleaseStatic libiconv.vcxproj
+      - name: Download libffi
+        if: steps.cache-libs.outputs.cache-hit != 'true'
+        uses: actions/checkout@v2
+        with:
+          repository: winlibs/libffi
+          ref: libffi-3.3
+          path: libffi
+      - name: Build libffi
+        if: steps.cache-libs.outputs.cache-hit != 'true'
+        working-directory: ./libffi
+        run: |
+          echo '<Project>
+            <PropertyGroup>
+              <ForceImportAfterCppTargets>$(MsbuildThisFileDirectory)\Override.props</ForceImportAfterCppTargets>
+            </PropertyGroup>
+          </Project>' > 'Directory.Build.props'
+
+          echo '<Project>
+            <ItemDefinitionGroup Label="Configuration">
+              <ClCompile>
+                <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+                <DebugInformationFormat>None</DebugInformationFormat>
+                <WholeProgramOptimization>false</WholeProgramOptimization>
+              </ClCompile>
+              <Link>
+                <GenerateDebugInformation>false</GenerateDebugInformation>
+              </Link>
+            </ItemDefinitionGroup>
+          </Project>' > 'Override.props'
+
+          MSBuild.exe /p:PlatformToolset=v143 /p:Platform=x64 /p:Configuration=Release win32\vs16_x64\libffi-msvc.sln -target:libffi:Rebuild
       - name: Download zlib
         if: steps.cache-libs.outputs.cache-hit != 'true'
         run: |
@@ -200,6 +232,7 @@ jobs:
           mv pcre/Release/pcre.lib libs/
           mv libiconv/lib64/libiconvStatic.lib libs/iconv.lib
           mv bdwgc/Release/gc.lib libs/
+          mv libffi/win32/vs16_x64/x64/Release/libffi.lib libs/ffi.lib
           mv zlib/Release/zlibstatic.lib libs/z.lib
           mv mpir/lib/x64/Release/mpir.lib libs/
           mv libyaml/Release/yaml.lib libs/
diff --git a/spec/compiler/ffi/ffi_spec.cr b/spec/compiler/ffi/ffi_spec.cr
index 4b70658e6bb8..5bf1b3cc97f2 100644
--- a/spec/compiler/ffi/ffi_spec.cr
+++ b/spec/compiler/ffi/ffi_spec.cr
@@ -1,4 +1,5 @@
-{% skip_file if !flag?(:unix) || flag?(:without_ffi) || flag?(:wasm32) %}
+{% skip_file if flag?(:without_ffi) || flag?(:wasm32) %}
+{% skip_file unless flag?(:unix) || flag?(:win32) %}
 
 require "../spec_helper"
 require "compiler/crystal/ffi"
@@ -167,34 +168,37 @@ describe Crystal::FFI::CallInterface do
       loader.try &.close_all
     end
 
-    it "array" do
-      call_interface = Crystal::FFI::CallInterface.new Crystal::FFI::Type.sint32, [
-        Crystal::FFI::Type.struct([
-          Crystal::FFI::Type.sint32,
-          Crystal::FFI::Type.sint32,
-          Crystal::FFI::Type.sint32,
-          Crystal::FFI::Type.sint32,
-        ]),
-      ] of Crystal::FFI::Type
-
-      loader = Crystal::Loader.new([SPEC_CRYSTAL_LOADER_LIB_PATH])
-      loader.load_library "sum"
-      function_pointer = loader.find_symbol("sum_array")
-
-      return_value = 0_i32
-
-      ary = [1, 2, 3, 4]
-
-      arg_pointers = StaticArray[
-        Pointer.malloc(1, ary.to_unsafe).as(Void*),
-        Pointer(Void).null,
-      ]
-
-      call_interface.call(function_pointer, arg_pointers.to_unsafe, pointerof(return_value).as(Void*))
-      return_value.should eq 10
-    ensure
-      loader.try &.close_all
-    end
+    # passing C array by value is not supported everywhere
+    {% unless flag?(:win32) %}
+      it "array" do
+        call_interface = Crystal::FFI::CallInterface.new Crystal::FFI::Type.sint32, [
+          Crystal::FFI::Type.struct([
+            Crystal::FFI::Type.sint32,
+            Crystal::FFI::Type.sint32,
+            Crystal::FFI::Type.sint32,
+            Crystal::FFI::Type.sint32,
+          ]),
+        ] of Crystal::FFI::Type
+
+        loader = Crystal::Loader.new([SPEC_CRYSTAL_LOADER_LIB_PATH])
+        loader.load_library "sum"
+        function_pointer = loader.find_symbol("sum_array")
+
+        return_value = 0_i32
+
+        ary = [1, 2, 3, 4]
+
+        arg_pointers = StaticArray[
+          Pointer.malloc(1, ary.to_unsafe).as(Void*),
+          Pointer(Void).null,
+        ]
+
+        call_interface.call(function_pointer, arg_pointers.to_unsafe, pointerof(return_value).as(Void*))
+        return_value.should eq 10
+      ensure
+        loader.try &.close_all
+      end
+    {% end %}
   end
 
   describe ".variadic" do