diff --git a/browser/themes/linux/browser.css b/browser/themes/linux/browser.css
index 1bd8229b47b5..dd4caa66e2d6 100644
--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@@ -700,6 +700,10 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   color: GrayText;
 }
 
+#search-container {
+  min-width: calc(54px + 11ch);
+}
+
 %include ../shared/identity-block.inc.css
 
 #page-proxy-favicon {
diff --git a/browser/themes/osx/browser.css b/browser/themes/osx/browser.css
index f8d9003962d4..984e60115a97 100644
--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@@ -1674,6 +1674,10 @@ toolbar .toolbarbutton-1:not([type="menu-button"]),
   height: 22px;
 }
 
+#search-container {
+  min-width: calc(54px + 11ch);
+}
+
 %include ../shared/identity-block.inc.css
 
 #page-proxy-favicon {
diff --git a/browser/themes/windows/browser.css b/browser/themes/windows/browser.css
index ad9382b9589b..56f59c276219 100644
--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@@ -956,6 +956,10 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
   color: GrayText;
 }
 
+#search-container {
+  min-width: calc(54px + 11ch);
+}
+
 /* identity box */
 
 #identity-box {