diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index 5782db4454..0bfff8de27 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -141,11 +141,7 @@ float Planner::min_feedrate_mm_s,
     float Planner::xy_skew_factor;
     #if ENABLED(SKEW_CORRECTION_FOR_Z)
       float Planner::xz_skew_factor, Planner::yz_skew_factor;
-    #else
-      constexpr float Planner::xz_skew_factor, Planner::yz_skew_factor;
     #endif
-  #else
-    constexpr float Planner::xy_skew_factor, Planner::xz_skew_factor, Planner::yz_skew_factor;
   #endif
 #endif