diff --git a/lib/evalmath/evalmath.class.php b/lib/evalmath/evalmath.class.php
index aa5539fe186d7..9d9c7d6250bd3 100644
--- a/lib/evalmath/evalmath.class.php
+++ b/lib/evalmath/evalmath.class.php
@@ -107,7 +107,7 @@ class EvalMath {
         'sin','sinh','arcsin','asin','arcsinh','asinh',
         'cos','cosh','arccos','acos','arccosh','acosh',
         'tan','tanh','arctan','atan','arctanh','atanh',
-        'sqrt','abs','ln','log','exp','floor','ceil','round');
+        'sqrt','abs','ln','log','exp','floor','ceil');
 
     var $fc = array( // calc functions emulation
         'average'=>array(-1), 'max'=>array(-1),  'min'=>array(-1),
diff --git a/lib/simpletest/testmathslib.php b/lib/simpletest/testmathslib.php
index f1cfb5664de40..2b53a9fad4c35 100644
--- a/lib/simpletest/testmathslib.php
+++ b/lib/simpletest/testmathslib.php
@@ -149,6 +149,10 @@ public function test__error_handling() {
     }
 
     public function test_rounding_function() {
+
+        // Rounding to the default number of decimal places
+        // The default == 0
+
         $formula = new calc_formula('=round(2.5)');
         $this->assertEqual($formula->evaluate(), 3);
 
@@ -203,6 +207,20 @@ public function test_rounding_function() {
         $formula = new calc_formula('=floor(-2.5)');
         $this->assertEqual($formula->evaluate(), -3);
 
+        // Rounding to an explicit number of decimal places
+
+        $formula = new calc_formula('=round(2.5, 1)');
+        $this->assertEqual($formula->evaluate(), 2.5);
+
+        $formula = new calc_formula('=round(2.5, 0)');
+        $this->assertEqual($formula->evaluate(), 3);
+
+        $formula = new calc_formula('=round(1.2345, 2)');
+        $this->assertEqual($formula->evaluate(), 1.23);
+
+        $formula = new calc_formula('=round(123.456, -1)');
+        $this->assertEqual($formula->evaluate(), 120);
+
     }
 
     public function test_scientific_notation() {