diff --git a/Source/Constraint.swift b/Source/Constraint.swift
index e3ca732..0825ef1 100644
--- a/Source/Constraint.swift
+++ b/Source/Constraint.swift
@@ -400,7 +400,7 @@ private extension NSLayoutAttribute {
                 case .Leading: return point.x
                 case .Trailing: return point.x
                 case .Width, .Height, .NotAnAttribute: return CGFloat(0)
-                default: return CGFloat(0)
+                case .FirstBaseline: return point.y
                 }
             #endif
         }
@@ -425,7 +425,7 @@ private extension NSLayoutAttribute {
                 case .Leading: return  (Config.interfaceLayoutDirection == .LeftToRight) ? insets.left : -insets.right
                 case .Trailing: return  (Config.interfaceLayoutDirection == .LeftToRight) ? insets.right : -insets.left
                 case .Width, .Height, .NotAnAttribute: return CGFloat(0)
-                default: return CGFloat(0)
+                case .FirstBaseline: return insets.bottom
                 }
             #endif
         }