diff --git a/src/css/core/function/_media-query.scss b/src/css/core/function/_media-query.scss
index 611ad892..6d00fb99 100644
--- a/src/css/core/function/_media-query.scss
+++ b/src/css/core/function/_media-query.scss
@@ -60,7 +60,7 @@ Return max size.
 @function _max($size) {
   $next_size: _next-size-key($size);
   @if (false != $next_size) {
-    $max: _rem2px(map-get($_sizes, $next_size)) - 1;
+    $max: map-get($_sizes, $next_size) - 1;
     @return $max;
   } @else if ('number' == type-of($size)) {
     @return $size;
diff --git a/tests/tests.scss b/tests/tests.scss
index dd969fd7..e756b071 100644
--- a/tests/tests.scss
+++ b/tests/tests.scss
@@ -116,9 +116,9 @@
 }
 
 @include _test('[function] _max()') {
-  @include _assert-equals(_px2em(_rem2px(map-get($_sizes, md)) - 1px), _max(sm));
-  @include _assert-equals(_px2em(_rem2px(map-get($_sizes, lg)) - 1px), _max(md));
-  @include _assert-equals(_px2em(_rem2px(map-get($_sizes, xl)) - 1px), _max(lg));
+  @include _assert-equals(map-get($_sizes, md) - 1px, _max(sm));
+  @include _assert-equals(map-get($_sizes, lg) - 1px, _max(md));
+  @include _assert-equals(map-get($_sizes, xl) - 1px, _max(lg));
   @include _assert-equals(false, _max(xl));
   @include _assert-equals(false, _max(dummy));
   @include _assert-equals(0, _max(0));