diff --git a/src/pab/pab_cloisons.ts b/src/pab/pab_cloisons.ts
index c5758365c75826fa0da60a1f058fee7f4f20c6ec..d37d473e68f003250c4b42394b5c31d06d176ecd 100644
--- a/src/pab/pab_cloisons.ts
+++ b/src/pab/pab_cloisons.ts
@@ -27,7 +27,7 @@ class PabCloisonsParams extends CloisonsParams {
         this.addParamDefinition(this.Pr, true);
 
         // Débit d'attrait
-        this._QA = new ParamDefinition(this, "QA", ParamDomainValue.ANY, rQA, ParamFamily.FLOWS);
+        this._QA = new ParamDefinition(this, "QA", ParamDomainValue.POS_NULL, rQA, ParamFamily.FLOWS);
         this.addParamDefinition(this._QA);
     }