diff --git a/core/src/components/fab-button/fab-button.scss b/core/src/components/fab-button/fab-button.scss
index ae24110897..4ca8ec024c 100755
--- a/core/src/components/fab-button/fab-button.scss
+++ b/core/src/components/fab-button/fab-button.scss
@@ -132,7 +132,7 @@
 // --------------------------------------------------
 
 :host(.fab-button-disabled) {
-  --opacity: .5;
+  opacity: .5;
 
   pointer-events: none;
 }