diff --git a/src/Nazara/Widgets/BoxLayout.cpp b/src/Nazara/Widgets/BoxLayout.cpp
index 48599fcd8..e071815b6 100644
--- a/src/Nazara/Widgets/BoxLayout.cpp
+++ b/src/Nazara/Widgets/BoxLayout.cpp
@@ -99,7 +99,7 @@ namespace Nz
 
 		kiwi::Variable targetSize("LayoutSize");
 
-		m_state->solver.addConstraint(sizeSum <= targetSize | kiwi::strength::strong);
+		m_state->solver.addConstraint((sizeSum <= targetSize) | kiwi::strength::strong);
 
 		m_state->solver.addEditVariable(targetSize, kiwi::strength::strong);
 		m_state->solver.suggestValue(targetSize, availableSpace);