diff --git a/skeleton/core/_functions.scss b/skeleton/core/_functions.scss
index 931a32c..4fcc753 100644
--- a/skeleton/core/_functions.scss
+++ b/skeleton/core/_functions.scss
@@ -49,9 +49,9 @@
 @function relative($size) {
 	@if($use-rem == true and $use-em == false and $use-percent == false) {
 		@return rem($size);
-	} @elseif($use-em == true and $use-rem == false and $use-percent == false) {
+	} @else if($use-em == true and $use-rem == false and $use-percent == false) {
 		@return em($size);
-	} @elseif($use-percent == true and $use-rem == false and $use-em == false) {
+	} @else if($use-percent == true and $use-rem == false and $use-em == false) {
 		@return percent($size);
 	}
 
diff --git a/skeleton/core/_mixins.scss b/skeleton/core/_mixins.scss
index 6fb4d6d..adc9ac4 100644
--- a/skeleton/core/_mixins.scss
+++ b/skeleton/core/_mixins.scss
@@ -41,9 +41,9 @@
 
 	@if($use-rem and not $use-em and not $use-percent) {
 		font-size: rem($size);
-	} @elseif($use-em and not $use-rem and not $use-percent) {
+	} @else if($use-em and not $use-rem and not $use-percent) {
 		font-size: em($size);
-	} @elseif($use-percent and not $use-rem and not $use-em) {
+	} @else if($use-percent and not $use-rem and not $use-em) {
 		font-size: percent($size);
 	} @else {
 		@debug "More than one option is chosen for the default unit. Choose only one. Defaulting to px.";