diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ce7043ed..ad0695ea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -174,13 +174,13 @@ jobs:
       - name: AVR
         run: avr-g++ -std=c++11 -Isrc extras/conf_test/avr.cpp
       - name: GCC 32-bit
-        run: g++ -std=c++11 -m32 -Isrc extras/conf_test/x86.cpp
+        run: g++ -std=c++11 -m32 -Isrc extras/conf_test/linux32.cpp
       - name: GCC 64-bit
-        run: g++ -std=c++11 -m64 -Isrc extras/conf_test/x64.cpp
+        run: g++ -std=c++11 -m64 -Isrc extras/conf_test/linux64.cpp
       - name: Clang 32-bit
-        run: clang++ -std=c++11 -m32 -Isrc extras/conf_test/x86.cpp
+        run: clang++ -std=c++11 -m32 -Isrc extras/conf_test/linux32.cpp
       - name: Clang 64-bit
-        run: clang++ -std=c++11 -m64 -Isrc extras/conf_test/x64.cpp
+        run: clang++ -std=c++11 -m64 -Isrc extras/conf_test/linux64.cpp
 
   conf_test_windows:
     name: Test configuration on Windows
@@ -192,12 +192,12 @@ jobs:
       - name: 32-bit
         run: |
           call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars32.bat"
-          cl /Isrc extras/conf_test/x86.cpp
+          cl /Isrc extras/conf_test/win32.cpp
         shell: cmd
       - name: 64-bit
         run: |
           call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-          cl /Isrc extras/conf_test/x64.cpp
+          cl /Isrc extras/conf_test/win64.cpp
         shell: cmd
 
   xcode:
diff --git a/extras/conf_test/x86.cpp b/extras/conf_test/linux32.cpp
similarity index 100%
rename from extras/conf_test/x86.cpp
rename to extras/conf_test/linux32.cpp
diff --git a/extras/conf_test/x64.cpp b/extras/conf_test/linux64.cpp
similarity index 100%
rename from extras/conf_test/x64.cpp
rename to extras/conf_test/linux64.cpp
diff --git a/extras/conf_test/win32.cpp b/extras/conf_test/win32.cpp
new file mode 100644
index 00000000..a9874efd
--- /dev/null
+++ b/extras/conf_test/win32.cpp
@@ -0,0 +1,14 @@
+#include <ArduinoJson.h>
+
+static_assert(ARDUINOJSON_USE_LONG_LONG == 1, "ARDUINOJSON_USE_LONG_LONG");
+
+static_assert(ARDUINOJSON_SLOT_ID_SIZE == 2, "ARDUINOJSON_SLOT_ID_SIZE");
+
+static_assert(ARDUINOJSON_LITTLE_ENDIAN == 1, "ARDUINOJSON_LITTLE_ENDIAN");
+
+static_assert(ARDUINOJSON_USE_DOUBLE == 1, "ARDUINOJSON_USE_DOUBLE");
+
+static_assert(sizeof(ArduinoJson::detail::VariantSlot) == 16,
+              "sizeof(VariantSlot)");
+
+int main() {}
diff --git a/extras/conf_test/win64.cpp b/extras/conf_test/win64.cpp
new file mode 100644
index 00000000..2b533bf7
--- /dev/null
+++ b/extras/conf_test/win64.cpp
@@ -0,0 +1,14 @@
+#include <ArduinoJson.h>
+
+static_assert(ARDUINOJSON_USE_LONG_LONG == 1, "ARDUINOJSON_USE_LONG_LONG");
+
+static_assert(ARDUINOJSON_SLOT_ID_SIZE == 4, "ARDUINOJSON_SLOT_ID_SIZE");
+
+static_assert(ARDUINOJSON_LITTLE_ENDIAN == 1, "ARDUINOJSON_LITTLE_ENDIAN");
+
+static_assert(ARDUINOJSON_USE_DOUBLE == 1, "ARDUINOJSON_USE_DOUBLE");
+
+static_assert(sizeof(ArduinoJson::detail::VariantSlot) == 24,
+              "sizeof(VariantSlot)");
+
+int main() {}