diff --git a/source/engine/traverse.js b/source/engine/traverse.js
index d162054c5..fc71e87db 100644
--- a/source/engine/traverse.js
+++ b/source/engine/traverse.js
@@ -91,9 +91,12 @@ let fillVariableNode = (rules, rule) => (parseResult) => {
 						? null // pas moyen de calculer car il n'y a pas de formule, elle restera donc nulle
 						: parsedRule.nodeValue, // la valeur du calcul fait foi
 			explanation = parsedRule,
-			missingVariables = variableIsCalculable ? [] : (nodeValue == null ? [dottedName] : [])
+			missingVariables = variableIsCalculable ? [] : [dottedName]
 
-			let collectMissing = node => variableIsCalculable ? collectNodeMissing(parsedRule) : node.missingVariables
+			let collectMissing = node =>
+				nodeValue != null ? // notamment si situationValue != null
+					[] :
+					variableIsCalculable ? collectNodeMissing(parsedRule) : node.missingVariables
 
 			let result = cached ? cached : {
 				...rewriteNode(node,nodeValue,explanation,collectMissing),
diff --git a/test/generateQuestions.test.js b/test/generateQuestions.test.js
index 7bfb8c6f6..7c1b55f48 100644
--- a/test/generateQuestions.test.js
+++ b/test/generateQuestions.test.js
@@ -93,6 +93,19 @@ describe('collectMissingVariables', function() {
     expect(result).to.deep.equal({})
   });
 
+  it('should not report missing variables when "une possibilité" was answered', function() {
+    let mySelector = (name) => ({"top . trois":"ko"})[name]
+
+    let rawRules = [
+          {nom: "startHere", formule: "trois", espace: "top"},
+          {nom: "trois", formule: {"une possibilité":["ko"]}, espace: "top"}],
+        rules = rawRules.map(enrichRule),
+        situation = analyseTopDown(rules,"startHere")(mySelector),
+        result = collectMissingVariables()(mySelector,situation)
+
+    expect(result).to.deep.equal({})
+  });
+
   it('should report missing variables in switch statements', function() {
     let rawRules = [
           { nom: "startHere", formule: {"aiguillage numérique": {