diff --git a/kiwi/kiwi/constraint.h b/kiwi/kiwi/constraint.h
index e772036..c6eae68 100644
--- a/kiwi/kiwi/constraint.h
+++ b/kiwi/kiwi/constraint.h
@@ -63,8 +63,8 @@ class ConstraintData : public SharedData
         switch (m_op)
         {
             case OP_EQ: return !impl::nearZero(m_expression.value());
-            case OP_GE: return m_expression.value() < 0.0;
-            case OP_LE: return m_expression.value() > 0.0;
+            case OP_GE: return m_expression.value() < impl::EPSILON;
+            case OP_LE: return m_expression.value() > impl::EPSILON;
         }
         std::abort();
     }
diff --git a/kiwi/kiwi/util.h b/kiwi/kiwi/util.h
index 560a43a..1fd2723 100644
--- a/kiwi/kiwi/util.h
+++ b/kiwi/kiwi/util.h
@@ -13,10 +13,11 @@ namespace kiwi
 namespace impl
 {
 
+constexpr const double EPSILON = 1.0e-8;
+
 inline bool nearZero(double value)
 {
-    const double eps = 1.0e-8;
-    return value < 0.0 ? -value < eps : value < eps;
+    return value < 0.0 ? -value < EPSILON : value < EPSILON;
 }
 
 } // namespace impl