diff --git a/libs/kimath/include/math/box2.h b/libs/kimath/include/math/box2.h
index 258f226d8c..81849e67ba 100644
--- a/libs/kimath/include/math/box2.h
+++ b/libs/kimath/include/math/box2.h
@@ -837,7 +837,7 @@ public:
         return ( t1.m_Pos != t2.m_Pos || t1.m_Size != t2.m_Size );
     }
 
-    const bool IsValid() const
+    bool IsValid() const
     {
         return m_init;
     }