diff --git a/scss/_mixins.scss b/scss/_mixins.scss
index cc957843f2..843303d453 100644
--- a/scss/_mixins.scss
+++ b/scss/_mixins.scss
@@ -15,7 +15,6 @@
 @import "mixins/badge";
 @import "mixins/resize";
 @import "mixins/screen-reader";
-@import "mixins/size";
 @import "mixins/reset-text";
 @import "mixins/text-emphasis";
 @import "mixins/text-hide";
diff --git a/scss/mixins/_size.scss b/scss/mixins/_size.scss
deleted file mode 100644
index 69e056d2c1..0000000000
--- a/scss/mixins/_size.scss
+++ /dev/null
@@ -1,7 +0,0 @@
-// Sizing shortcuts
-
-@mixin size($width, $height: $width) {
-  width: $width;
-  height: $height;
-  @include deprecate("`size()`", "v4.3.0", "v5");
-}