diff --git a/scss/bootstrap-progressbar-2.x.x.scss b/scss/bootstrap-progressbar-2.x.x.scss
index 739faf5..5007722 100644
--- a/scss/bootstrap-progressbar-2.x.x.scss
+++ b/scss/bootstrap-progressbar-2.x.x.scss
@@ -1,5 +1,5 @@
-$progressbarVerticalWidth: $baseLineHeight;
-$progressbarFontSize: 12px;
+$progressbarVerticalWidth: $baseLineHeight !default;
+$progressbarFontSize: 12px !default;
 
 // bootstrap-progressbar global styles
 // -----------------------------------
diff --git a/scss/bootstrap-progressbar-3.0.0-3.1.x.scss b/scss/bootstrap-progressbar-3.0.0-3.1.x.scss
index b14d5ba..771c773 100644
--- a/scss/bootstrap-progressbar-3.0.0-3.1.x.scss
+++ b/scss/bootstrap-progressbar-3.0.0-3.1.x.scss
@@ -1,5 +1,5 @@
-$progressbarVerticalWidth: $line-height-computed;
-$progressbarFontSize: $font-size-small;
+$progressbarVerticalWidth: $line-height-computed !default;
+$progressbarFontSize: $font-size-small !default;
 
 // bootstrap-progressbar global styles
 // -----------------------------------
diff --git a/scss/bootstrap-progressbar-3.2.0.scss b/scss/bootstrap-progressbar-3.2.0.scss
index ced685c..b74c560 100644
--- a/scss/bootstrap-progressbar-3.2.0.scss
+++ b/scss/bootstrap-progressbar-3.2.0.scss
@@ -1,5 +1,5 @@
-$progressbarVerticalWidth: $line-height-computed;
-$progressbarFontSize: $font-size-small;
+$progressbarVerticalWidth: $line-height-computed !default;
+$progressbarFontSize: $font-size-small !default;
 
 // bootstrap-progressbar global styles
 // -----------------------------------
diff --git a/scss/bootstrap-progressbar-3.3.0-3.x.x.scss b/scss/bootstrap-progressbar-3.3.0-3.x.x.scss
index b14d5ba..771c773 100644
--- a/scss/bootstrap-progressbar-3.3.0-3.x.x.scss
+++ b/scss/bootstrap-progressbar-3.3.0-3.x.x.scss
@@ -1,5 +1,5 @@
-$progressbarVerticalWidth: $line-height-computed;
-$progressbarFontSize: $font-size-small;
+$progressbarVerticalWidth: $line-height-computed !default;
+$progressbarFontSize: $font-size-small !default;
 
 // bootstrap-progressbar global styles
 // -----------------------------------