diff --git a/Marlin/Conditionals_post.h b/Marlin/Conditionals_post.h
index 244fe8851cb..027e4bad0ba 100644
--- a/Marlin/Conditionals_post.h
+++ b/Marlin/Conditionals_post.h
@@ -867,7 +867,7 @@
 
     #define _GET_SIDE(a,b,c) (SQRT(2*sq(a)+2*sq(b)-4*sq(c))*0.5)
     #define _SKEW_SIDE(a,b,c) tan(M_PI*0.5-acos((sq(a)-sq(b)-sq(c))/(2*c*b)))
-    #define _SKEW_FACTOR(a,b,c) _SKEW_SIDE(a,_GET_SIDE(a,b,c),c)
+    #define _SKEW_FACTOR(a,b,c) _SKEW_SIDE(float(a),_GET_SIDE(float(a),float(b),float(c)),float(c))
 
     #ifndef XY_SKEW_FACTOR
       constexpr float XY_SKEW_FACTOR = (