diff --git a/papaparse.js b/papaparse.js
index cea444e..059ccbb 100755
--- a/papaparse.js
+++ b/papaparse.js
@@ -1024,7 +1024,7 @@
 			_delimiterError = false;
 			if (!_config.delimiter)
 			{
-				var delimGuess = guessDelimiter(input, _config.newline, _config.skipEmptyLines, _config.comments, _config.additionalDelimitersToGuess);
+				var delimGuess = guessDelimiter(input, _config.newline, _config.skipEmptyLines, _config.comments);
 				if (delimGuess.successful)
 					_config.delimiter = delimGuess.bestDelimiter;
 				else
@@ -1208,10 +1208,9 @@
 			return _results;
 		}
 
-		function guessDelimiter(input, newline, skipEmptyLines, comments, additionalDelimitersToGuess)
+		function guessDelimiter(input, newline, skipEmptyLines, comments)
 		{
-			additionalDelimitersToGuess = additionalDelimitersToGuess || [];
-			var delimChoices = [',', '\t', '|', ';', Papa.RECORD_SEP, Papa.UNIT_SEP].concat(additionalDelimitersToGuess);
+			var delimChoices = [',', '\t', '|', ';', Papa.RECORD_SEP, Papa.UNIT_SEP];
 			var bestDelim, bestDelta, fieldCountPrevRow;
 
 			for (var i = 0; i < delimChoices.length; i++)
diff --git a/tests/test-cases.js b/tests/test-cases.js
index 60fd25b..deb2e65 100644
--- a/tests/test-cases.js
+++ b/tests/test-cases.js
@@ -2110,6 +2110,7 @@ var CUSTOM_TESTS = [
 			});
 		}
 	}
+
 ];
 
 describe('Custom Tests', function() {
@@ -2126,42 +2127,3 @@ describe('Custom Tests', function() {
 		generateTest(CUSTOM_TESTS[i]);
 	}
 });
-
-
-var DELIMITERS_TO_GUESS_TESTS = [
-	{
-		description: "Should correctly guess custom delimiter when passed additional delimiters to guess.",
-		expected: "~",
-		run: function(callback) {
-			var results = Papa.parse('"A"~"B"~"C"~"D"', {
-				additionalDelimitersToGuess: ['~', '@', '%']
-			});
-			callback(results.meta.delimiter);
-		}
-	},
-	{
-		description: "Should still correctly guess default delimiters when additional delimiters to guess are given.",
-		expected: ",",
-		run: function(callback) {
-			var results = Papa.parse('"A","B","C","D"', {
-				additionalDelimitersToGuess: ['~', '@', '%']
-			});
-			callback(results.meta.delimiter);
-		}
-	}
-];
-
-describe('Additional Delimiters to Guess Tests', function() {
-	function generateTest(test) {
-		(test.disabled ? it.skip : it)(test.description, function(done) {
-			test.run(function(actual) {
-				assert.deepEqual(JSON.stringify(actual), JSON.stringify(test.expected));
-				done();
-			});
-		});
-	}
-
-	for (var i = 0; i < DELIMITERS_TO_GUESS_TESTS.length; i++) {
-		generateTest(DELIMITERS_TO_GUESS_TESTS[i]);
-	}
-});