diff --git a/scss/forms/_input-group.scss b/scss/forms/_input-group.scss
index d2e7d91aaa..05eae6a49a 100644
--- a/scss/forms/_input-group.scss
+++ b/scss/forms/_input-group.scss
@@ -123,11 +123,14 @@
 // Remix the default form control sizing classes into new ones for easier
 // manipulation.
 
-.input-group-lg > .form-control:not(textarea),
-.input-group-lg > .form-select {
+.input-group-lg > .form-control {
   min-height: $input-height-lg;
 }
 
+.input-group-lg > .form-select {
+  height: $input-height-lg;
+}
+
 .input-group-lg > .form-control,
 .input-group-lg > .form-select,
 .input-group-lg > .input-group-prepend > .input-group-text,
@@ -140,11 +143,14 @@
   @include border-radius($input-border-radius-lg);
 }
 
-.input-group-sm > .form-control:not(textarea),
-.input-group-sm > .form-select {
+.input-group-sm > .form-control {
   min-height: $input-height-sm;
 }
 
+.input-group-sm > .form-select {
+  height: $input-height-sm;
+}
+
 .input-group-sm > .form-control,
 .input-group-sm > .form-select,
 .input-group-sm > .input-group-prepend > .input-group-text,