diff --git a/package.json b/package.json
index 5f29ede..8f3a53e 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "diff": "^1.2.1",
     "fs-extra": "^0.14.0",
     "glob": "^4.3.2",
-    "node-sass": "^3.0.0",
+    "node-sass": "^4.8.3",
     "semver": "^5.1.0",
     "yargs": "^4.1.0"
   },
diff --git a/stylesheets/singularitygs/_api.scss b/stylesheets/singularitygs/_api.scss
index 18f5940..5db6951 100644
--- a/stylesheets/singularitygs/_api.scss
+++ b/stylesheets/singularitygs/_api.scss
@@ -56,11 +56,19 @@
     $Right: ();
 
     @if $Direction == 'both' or $From == 'left' or ($Direction == 'rtl' and $From == 'opposite') {
-      $Left: call('output-#{$output-style}', map-merge($Span-Map, ('direction': left)));
+      @if (function-exists('get-function')) {
+        $Left: call(get-function('output-#{$output-style}'), map-merge($Span-Map, ('direction': left)));
+      } @else {
+        $Left: call('output-#{$output-style}', map-merge($Span-Map, ('direction': left)));
+      }
     }
 
     @if $Direction == 'both' or $From == 'right' or ($Direction == 'ltr' and $From == 'opposite') {
-      $Right: call('output-#{$output-style}', map-merge($Span-Map, ('direction': right)));
+      @if (function-exists('get-function')) {
+        $Right: call(get-function('output-#{$output-style}'), map-merge($Span-Map, ('direction': right)));
+      } @else {
+        $Right: call('output-#{$output-style}', map-merge($Span-Map, ('direction': right)));
+      }
     }
 
     $Left-Keys: map-keys($Left);
@@ -115,4 +123,4 @@
       @include grid-span-build($property, $value);
     }
   }
-}
\ No newline at end of file
+}