diff --git a/lib/helpers.js b/lib/helpers.js
index 5ef57f01..c613c47d 100644
--- a/lib/helpers.js
+++ b/lib/helpers.js
@@ -374,7 +374,7 @@ exports.setVar = function (varName, argument) {
 };
 
 exports.parseIfArgs = function (args, parser) {
-  var operators = ['==', '<', '>', '!=', '<=', '>=', '===', '!==', '&&', '||', 'in', 'and', 'or'],
+  var operators = ['==', '<', '>', '!=', '<=', '>=', '===', '!==', '&&', '||', 'in', 'and', 'or', 'mod', '%'],
     errorString = 'Bad if-syntax in `{% if ' + args.join(' ') + ' %}...',
     tokens = [],
     prevType,
@@ -416,7 +416,7 @@ exports.parseIfArgs = function (args, parser) {
       if (prevType === 'operator') {
         throw new Error(errorString);
       }
-      value = value.replace('and', '&&').replace('or', '||');
+      value = value.replace('and', '&&').replace('or', '||').replace('mod', '%');
       tokens.push({
         value: value
       });
diff --git a/tests/node/tags/if.test.js b/tests/node/tags/if.test.js
index b4e6175b..650ea8db 100644
--- a/tests/node/tags/if.test.js
+++ b/tests/node/tags/if.test.js
@@ -43,6 +43,37 @@ describe('Tag: if', function () {
     expect(tpl({ foo: 'b', bar: ['a', 'b', 'c'] })).to.equal('hi!');
   });
 
+  it('can use the "%" operator', function () {
+    var tpl = swig.compile('{% if foo % 2 == 0 %}hi!{% endif %}');
+    expect(tpl({ foo: 4 })).to.equal('hi!');
+
+    tpl = swig.compile('{% if foo % 2 == 0 %}hi!{% endif %}');
+    expect(tpl({ foo: 5 })).to.equal('');
+
+    tpl = swig.compile('{% if foo % 2 %}hi!{% endif %}');
+    expect(tpl({ foo: 4 })).to.equal('');
+
+    tpl = swig.compile('{% if foo % 2 %}hi!{% endif %}');
+    expect(tpl({ foo: 3 })).to.equal('hi!');
+
+  });
+
+  it('can use the "mod" operator', function () {
+    var tpl = swig.compile('{% if foo mod 2 == 0 %}hi!{% endif %}');
+    expect(tpl({ foo: 4 })).to.equal('hi!');
+
+    tpl = swig.compile('{% if foo mod 2 == 0 %}hi!{% endif %}');
+    expect(tpl({ foo: 5 })).to.equal('');
+
+    tpl = swig.compile('{% if foo mod 2 %}hi!{% endif %}');
+    expect(tpl({ foo: 4 })).to.equal('');
+
+    tpl = swig.compile('{% if foo mod 2 %}hi!{% endif %}');
+    expect(tpl({ foo: 3 })).to.equal('hi!');
+
+  });
+
+
   it('throws on bad conditional syntax', function () {
     var fn1 = function () {
         swig.compile('{% if foo bar %}{% endif %}');