diff --git a/src/core/include/units/magnitude.h b/src/core/include/units/magnitude.h
index dc3ac304..5f01a0fa 100644
--- a/src/core/include/units/magnitude.h
+++ b/src/core/include/units/magnitude.h
@@ -33,7 +33,7 @@ namespace units {
 namespace detail
 {
 // Higher numbers use fewer trial divisions, at the price of more storage space.
-using Factorizer = WheelFactorizer<3>;
+using Factorizer = WheelFactorizer<4>;
 } // namespace detail
 
 /**