diff --git a/test/fixtures/index.js b/test/fixtures/index.js
index e486934a..32c2e655 100644
--- a/test/fixtures/index.js
+++ b/test/fixtures/index.js
@@ -93,6 +93,7 @@ module.exports = {
   inputPngImageInAlpha: getPath('image-in-alpha.png'), // https://github.com/lovell/sharp/issues/1597
   inputPngSolidAlpha: getPath('with-alpha.png'), // https://github.com/lovell/sharp/issues/1599
   inputPngP3: getPath('p3.png'), // https://github.com/lovell/sharp/issues/2862
+  inputPngPalette: getPath('swiss.png'), // https://github.com/randy408/libspng/issues/188
 
   inputWebP: getPath('4.webp'), // http://www.gstatic.com/webp/gallery/4.webp
   inputWebPWithTransparency: getPath('5_webp_a.webp'), // http://www.gstatic.com/webp/gallery3/5_webp_a.webp
diff --git a/test/fixtures/swiss.png b/test/fixtures/swiss.png
new file mode 100644
index 00000000..cf310ec6
Binary files /dev/null and b/test/fixtures/swiss.png differ
diff --git a/test/unit/png.js b/test/unit/png.js
index 3a8d940d..e996b514 100644
--- a/test/unit/png.js
+++ b/test/unit/png.js
@@ -128,6 +128,12 @@ describe('PNG', function () {
     assert.strictEqual(alphaMeanAfter, alphaMeanBefore);
   });
 
+  it('palette decode/encode roundtrip', () =>
+    sharp(fixtures.inputPngPalette)
+      .png({ effort: 1, palette: true })
+      .toBuffer()
+  );
+
   it('Valid PNG libimagequant palette value does not throw error', function () {
     assert.doesNotThrow(function () {
       sharp().png({ palette: false });