diff --git a/scss/_buttons.scss b/scss/_buttons.scss
index 3a5f5ee85b..41b7068224 100644
--- a/scss/_buttons.scss
+++ b/scss/_buttons.scss
@@ -34,12 +34,12 @@
   }
 
   // Opinionated: add "hand" cursor to non-disabled .btn elements
-  &:not([disabled]):not(.disabled) {
+  &:not(:disabled):not(.disabled) {
     cursor: pointer;
   }
 
-  &:not([disabled]):not(.disabled):active,
-  &:not([disabled]):not(.disabled).active {
+  &:not(:disabled):not(.disabled):active,
+  &:not(:disabled):not(.disabled).active {
     background-image: none;
     @include box-shadow($btn-active-box-shadow);
 
@@ -51,7 +51,7 @@
 
 // Future-proof disabling of clicks on `<a>` elements
 a.btn.disabled,
-fieldset[disabled] a.btn {
+fieldset:disabled a.btn {
   pointer-events: none;
 }
 
diff --git a/scss/_close.scss b/scss/_close.scss
index f1763cc224..871cb08fd8 100644
--- a/scss/_close.scss
+++ b/scss/_close.scss
@@ -14,7 +14,7 @@
   }
 
   // Opinionated: add "hand" cursor to non-disabled .close elements
-  &:not([disabled]):not(.disabled) {
+  &:not(:disabled):not(.disabled) {
     cursor: pointer;
   }
 }
diff --git a/scss/_navbar.scss b/scss/_navbar.scss
index 677a2753f6..8d68c6c8c4 100644
--- a/scss/_navbar.scss
+++ b/scss/_navbar.scss
@@ -118,7 +118,7 @@
   }
 
   // Opinionated: add "hand" cursor to non-disabled .navbar-toggler elements
-  &:not([disabled]):not(.disabled) {
+  &:not(:disabled):not(.disabled) {
     cursor: pointer;
   }
 }
diff --git a/scss/_pagination.scss b/scss/_pagination.scss
index b0193d170e..959b2eb4ba 100644
--- a/scss/_pagination.scss
+++ b/scss/_pagination.scss
@@ -28,7 +28,7 @@
   }
 
   // Opinionated: add "hand" cursor to non-disabled .page-link elements
-  &:not([disabled]):not(.disabled) {
+  &:not(:disabled):not(.disabled) {
     cursor: pointer;
   }
 }
diff --git a/scss/mixins/_buttons.scss b/scss/mixins/_buttons.scss
index e6ccbc6d48..1cbe671221 100644
--- a/scss/mixins/_buttons.scss
+++ b/scss/mixins/_buttons.scss
@@ -33,8 +33,8 @@
     border-color: $border;
   }
 
-  &:not([disabled]):not(.disabled):active,
-  &:not([disabled]):not(.disabled).active,
+  &:not(:disabled):not(.disabled):active,
+  &:not(:disabled):not(.disabled).active,
   .show > &.dropdown-toggle {
     color: color-yiq($active-background);
     background-color: $active-background;
@@ -77,8 +77,8 @@
     background-color: transparent;
   }
 
-  &:not([disabled]):not(.disabled):active,
-  &:not([disabled]):not(.disabled).active,
+  &:not(:disabled):not(.disabled):active,
+  &:not(:disabled):not(.disabled).active,
   .show > &.dropdown-toggle {
     color: color-yiq($active-background);
     background-color: $active-background;