diff --git a/src/scss/atlas-theme/variables/_progress-bars.scss b/src/scss/atlas-theme/variables/_progress-bars.scss
index 9418d54d1a..e2fd549f90 100644
--- a/src/scss/atlas-theme/variables/_progress-bars.scss
+++ b/src/scss/atlas-theme/variables/_progress-bars.scss
@@ -1,4 +1,5 @@
 $progress-border-radius: 100px !default;
+$progress-box-shadow: none !default;
 $progress-font-size: 0.5625rem !default;
 $progress-height: 0.5rem !default;
 
diff --git a/src/scss/lexicon-base/_progress-bars.scss b/src/scss/lexicon-base/_progress-bars.scss
index c0540130ea..9cb644d0e3 100644
--- a/src/scss/lexicon-base/_progress-bars.scss
+++ b/src/scss/lexicon-base/_progress-bars.scss
@@ -4,7 +4,9 @@
 }
 
 .progress-bar {
-	@include box-shadow($progress-bar-box-shadow);
+	@if ($progress-bar-box-shadow) {
+		@include box-shadow($progress-bar-box-shadow);
+	}
 }
 
 .progress-lg {