diff --git a/less/01-base.less b/less/01-base.less
index 5cbc60e..3fe697b 100644
--- a/less/01-base.less
+++ b/less/01-base.less
@@ -103,16 +103,16 @@ h6, .h6-like {
 	.em(@base-font-size - 4);
 }
 .small {
-	.em(@base-font-sizefont-stack-common - 2);
+	.em(@base-font-size - 2);
 }
 .big {
-	.em(@base-font-sizefont-stack-common + 2);
+	.em(@base-font-sizef + 2);
 }
 .bigger {
-	.em(@base-font-sizefont-stack-common + 4);
+	.em(@base-font-size + 4);
 }
 .biggest {
-	.em(@base-font-sizefont-stack-common + 6);
+	.em(@base-font-size + 6);
 }
 
 code,