diff --git a/src/themes/default/views/card.variables b/src/themes/default/views/card.variables
index 5c1d7491d..a81f13996 100644
--- a/src/themes/default/views/card.variables
+++ b/src/themes/default/views/card.variables
@@ -70,7 +70,7 @@
 @repeatedContentBorder: @borderWidth solid @internalBorderColor;
 
 /* Header */
-@headerMargin: 0em;
+@headerMargin: '';
 @headerFontWeight: bold;
 @headerFontSize: @relativeBig;
 @headerLineHeightOffset: -(@lineHeight - 1em) / 2;