diff --git a/less/_rotated-flipped.less b/less/_rotated-flipped.less
index b09e8e113..496b639fa 100644
--- a/less/_rotated-flipped.less
+++ b/less/_rotated-flipped.less
@@ -27,5 +27,5 @@
 }
 
 .@{fa-css-prefix}-rotate-by {
-  transform: rotate(~'var(--@{fa-css-prefix}-rotate-angle, none)');
+  transform: rotate(~'var(--@{fa-css-prefix}-rotate-angle, 0)');
 }
diff --git a/scss/_rotated-flipped.scss b/scss/_rotated-flipped.scss
index f27fabee4..da32b8caf 100644
--- a/scss/_rotated-flipped.scss
+++ b/scss/_rotated-flipped.scss
@@ -27,5 +27,5 @@
 }
 
 .#{$fa-css-prefix}-rotate-by {
-  transform: rotate(var(--#{$fa-css-prefix}-rotate-angle, none));
+  transform: rotate(var(--#{$fa-css-prefix}-rotate-angle, 0));
 }