diff --git a/devtools/client/framework/browser-toolbox/test/browser_browser_toolbox_print_preview.js b/devtools/client/framework/browser-toolbox/test/browser_browser_toolbox_print_preview.js
index 2c9a90961cfe..c1c624e90797 100644
--- a/devtools/client/framework/browser-toolbox/test/browser_browser_toolbox_print_preview.js
+++ b/devtools/client/framework/browser-toolbox/test/browser_browser_toolbox_print_preview.js
@@ -17,6 +17,10 @@ add_task(async function() {
   // Forces the Browser Toolbox to open on the inspector by default
   await pushPref("devtools.browsertoolbox.panel", "inspector");
 
+  // Force the modal print preview, otherwise the printPreview command will not
+  // open the expected UI.
+  await pushPref("print.tab_modal.enabled", true);
+
   // Open the tab *after* opening the Browser Toolbox in order to force creating the remote frames
   // late and exercise frame target watching code.
   await addTab(`data:text/html,<div id="test-div">PRINT PREVIEW TEST</div>`);