diff --git a/lib/output.js b/lib/output.js
index 055317ebb..2e63f53f3 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -229,7 +229,8 @@ const tiff = function tiff (options) {
     if (is.string(options.compression) && is.inArray(options.compression, ['lzw', 'deflate', 'jpeg', 'none'])) {
       this.options.tiffCompression = options.compression;
     } else {
-      throw new Error('Invalid compression option [' + options.compression + ']. Should be one of: lzw, deflate, jpeg, none');
+      const message = `Invalid compression option "${options.compression}". Should be one of: lzw, deflate, jpeg, none`;
+      throw new Error(message);
     }
   }
   // predictor
@@ -237,7 +238,8 @@ const tiff = function tiff (options) {
     if (is.string(options.predictor) && is.inArray(options.predictor, ['none', 'horizontal', 'float'])) {
       this.options.tiffPredictor = options.predictor;
     } else {
-      throw new Error('Invalid predictor option [' + options.predictor + ']. Should be one of: none, horizontal, float');
+      const message = `Invalid predictor option "${options.predictor}". Should be one of: none, horizontal, float`;
+      throw new Error(message);
     }
   }
   return this._updateFormatOut('tiff', options);
diff --git a/test/unit/io.js b/test/unit/io.js
index 1f3508751..2a31d5a92 100644
--- a/test/unit/io.js
+++ b/test/unit/io.js
@@ -861,12 +861,15 @@ describe('Input/output', function () {
     });
   });
 
-  it('TIFF lzw compression shrinks test file', function (done) {
+  it('TIFF lzw compression with horizontal predictor shrinks test file', function (done) {
     const startSize = fs.statSync(fixtures.inputTiffUncompressed).size;
     sharp(fixtures.inputTiffUncompressed)
           .tiff({
             compression: 'lzw',
             force: true,
+            // note: lzw compression is imperfect and sometimes
+            // generates larger files, as it does with this input
+            // if no predictor is used.
             predictor: 'horizontal'
           })
           .toFile(fixtures.outputTiff, (err, info) => {
@@ -878,6 +881,56 @@ describe('Input/output', function () {
           });
   });
 
+  it('TIFF deflate compression with hoizontal predictor shrinks test file', function (done) {
+    const startSize = fs.statSync(fixtures.inputTiffUncompressed).size;
+    sharp(fixtures.inputTiffUncompressed)
+          .tiff({
+            compression: 'deflate',
+            force: true,
+            predictor: 'horizontal'
+          })
+          .toFile(fixtures.outputTiff, (err, info) => {
+            if (err) throw err;
+            assert.strictEqual('tiff', info.format);
+            assert(info.size < startSize);
+            fs.unlinkSync(fixtures.outputTiff);
+            done();
+          });
+  });
+
+  it('TIFF deflate compression without predictor shrinks test file', function (done) {
+    const startSize = fs.statSync(fixtures.inputTiffUncompressed).size;
+    sharp(fixtures.inputTiffUncompressed)
+          .tiff({
+            compression: 'deflate',
+            force: true,
+            predictor: 'none'
+          })
+          .toFile(fixtures.outputTiff, (err, info) => {
+            if (err) throw err;
+            assert.strictEqual('tiff', info.format);
+            assert(info.size < startSize);
+            fs.unlinkSync(fixtures.outputTiff);
+            done();
+          });
+  });
+
+  it('TIFF jpeg compression shrinks test file', function (done) {
+    const startSize = fs.statSync(fixtures.inputTiffUncompressed).size;
+    sharp(fixtures.inputTiffUncompressed)
+          .tiff({
+            compression: 'jpeg',
+            force: true
+          })
+          .toFile(fixtures.outputTiff, (err, info) => {
+            if (err) throw err;
+            assert.strictEqual('tiff', info.format);
+            assert(info.size < startSize);
+            fs.unlinkSync(fixtures.outputTiff);
+            done();
+          });
+  });
+
   it('TIFF none compression does not throw error', function () {
     assert.doesNotThrow(function () {
       sharp().tiff({ compression: 'none' });