diff --git a/source/engine/grammar.ne b/source/engine/grammar.ne
index 103c04153..a3bb326b8 100644
--- a/source/engine/grammar.ne
+++ b/source/engine/grammar.ne
@@ -18,7 +18,7 @@ Comparison -> Comparable _ ComparisonOperator _ Comparable {% d => ({
 
 Comparable -> (int | CalcExpression | Variable | Constant) {% d => d[0][0] %}
 
-ComparisonOperator -> ">" | "<" | ">=" | "<=" | "="
+ComparisonOperator -> ">" | "<" | ">=" | "<=" | "=" | "!="
 
 NegatedVariable -> "≠" _ Variable {% d => ({category: 'negatedVariable', variable: d[2] }) %}
 
diff --git a/source/engine/traverse.js b/source/engine/traverse.js
index 563ec80e0..709ab1f43 100644
--- a/source/engine/traverse.js
+++ b/source/engine/traverse.js
@@ -201,12 +201,13 @@ let treat = (rules, rule) => rawNode => {
 							'<=': 'lte',
 							'>': 'gt',
 							'>=': 'gte',
-							'=': 'equals'
+							'=': 'equals',
+							'!=': 'equals'
 						}[node.operator],
 						explanation = R.map(R.curry(evaluateNode)(situation,parsedRules),node.explanation),
 						value1 = explanation[0].nodeValue,
 						value2 = explanation[1].nodeValue,
-						operatorFunction = R[operatorFunctionName],
+						operatorFunction = operatorFunctionName == "!=" ? (a => b => !R.equals(a,b)) : R[operatorFunctionName],
 						nodeValue = value1 == null || value2 == null ?
 							null
 						: operatorFunction(value1, value2)