diff --git a/.gitignore b/.gitignore
index 37f3f96..0d04d00 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,5 @@ examples/imgs/*
 !examples/imgs/photo.JPG
 !examples/imgs/orientation/*\d.jpg
 !examples/imgs/orientation/*.correct.jpg
-!examples/imgs/icon.ico
 *.sw*
 .idea
\ No newline at end of file
diff --git a/examples/imgs/icon.ico b/examples/imgs/icon.ico
deleted file mode 100644
index 200367a..0000000
Binary files a/examples/imgs/icon.ico and /dev/null differ
diff --git a/index.js b/index.js
index fb86a5e..6e622d8 100644
--- a/index.js
+++ b/index.js
@@ -74,7 +74,6 @@ function gm (source, height, color) {
     var inputFromStdin = this.sourceStream || this.sourceBuffer;
     var ret = inputFromStdin ? '-' : this.source;
 
-    if (inputFromStdin && this.source && this.source !== 'unknown.jpg') ret = this.source.split('.').pop() + ':-';
     if (ret && this.sourceFrames) ret += this.sourceFrames;
 
     src.length = 0;
diff --git a/test/formatInference.js b/test/formatInference.js
deleted file mode 100644
index 111c5df..0000000
--- a/test/formatInference.js
+++ /dev/null
@@ -1,21 +0,0 @@
-var assert = require('assert')
-var fs = require('fs');
-
-module.exports = function (_, dir, finish, gm) {
-  var m = gm(fs.createReadStream(dir + '/icon.ico'), 'icon.ico')
-
-  var args = m.args();
-  assert.equal('convert', args[0]);
-  assert.equal('ico:-', args[1]);
-
-  if (!gm.integration)
-    return finish();
-
-  m
-  .size({bufferStream: true}, function (err, size) { 
-    if (err) return finish(err);
-    assert.equal(128, size.width);
-    assert.equal(128, size.height);
-    finish();
-  });
-}
diff --git a/test/gifFrameStream.js b/test/gifFrameStream.js
index 1d7e447..5e1d912 100644
--- a/test/gifFrameStream.js
+++ b/test/gifFrameStream.js
@@ -1,3 +1,4 @@
+
 var assert = require('assert')
 var fs = require('fs');
 
@@ -6,7 +7,7 @@ module.exports = function (_, dir, finish, gm) {
 
   var args = m.args();
   assert.equal('convert', args[0]);
-  assert.equal('gif:-[0]', args[1]);
+  assert.equal('-[0]', args[1]);
 
   if (!gm.integration)
     return finish();
diff --git a/test/resizeAndAutoOrientFromBuffer.js b/test/resizeAndAutoOrientFromBuffer.js
index 9ece772..522bdf9 100755
--- a/test/resizeAndAutoOrientFromBuffer.js
+++ b/test/resizeAndAutoOrientFromBuffer.js
@@ -14,7 +14,7 @@ module.exports = function (_, dir, finish, gm) {
 
   var args = m.args();
   assert.equal('convert', args[0]);
-  assert.equal('jpg:-', args[1]);
+  assert.equal('-', args[1]);
   assert.equal('-resize', args[2]);
   if (m._options.imageMagick) {
     assert.equal('20%', args[3]);
diff --git a/test/resizeBuffer.js b/test/resizeBuffer.js
index 0e5c089..208e91a 100755
--- a/test/resizeBuffer.js
+++ b/test/resizeBuffer.js
@@ -13,7 +13,7 @@ module.exports = function (_, dir, finish, gm) {
 
   var args = m.args();
   assert.equal('convert', args[0]);
-  assert.equal('jpg:-', args[1]);
+  assert.equal('-', args[1]);
   assert.equal('-resize', args[2]);
   if (m._options.imageMagick) {
     assert.equal('48%', args[3]);
diff --git a/test/streamerr.js b/test/streamerr.js
index 099006e..d9f6c23 100644
--- a/test/streamerr.js
+++ b/test/streamerr.js
@@ -7,7 +7,8 @@ module.exports = function (_, dir, finish, gm) {
   // The following invocation should fail, because 'convert' 
   // has no way of interpreting the file.
   gm(
-    svg_file
+    svg_file, 
+    './test.svg' // fiction
     ).options({
       imageMagick: true
   }).setFormat('png').toBuffer(function(err, buffer) {