diff --git a/scripts/ci/prek/compile_ui_assets_dev.py b/scripts/ci/prek/compile_ui_assets_dev.py
index b927928b8b079..c2a26f5ad08dd 100755
--- a/scripts/ci/prek/compile_ui_assets_dev.py
+++ b/scripts/ci/prek/compile_ui_assets_dev.py
@@ -78,13 +78,14 @@
             stdout=f,
             stderr=subprocess.STDOUT,
         )
-        subprocess.Popen(
-            ["pnpm", "dev"],
-            cwd=os.fspath(UI_DIRECTORY),
-            env=env,
-            stdout=f,
-            stderr=subprocess.STDOUT,
-        )
+
+    subprocess.Popen(
+        ["pnpm", "dev"],
+        cwd=os.fspath(UI_DIRECTORY),
+        env=env,
+        stdout=open(UI_ASSET_OUT_DEV_MODE_FILE, "a"),
+        stderr=subprocess.STDOUT,
+    )
 
     with open(SIMPLE_AUTH_MANAGER_UI_ASSET_OUT_DEV_MODE_FILE, "w") as f:
         subprocess.run(
@@ -94,10 +95,11 @@
             stdout=f,
             stderr=subprocess.STDOUT,
         )
-        subprocess.Popen(
-            ["pnpm", "dev"],
-            cwd=os.fspath(SIMPLE_AUTH_MANAGER_UI_DIRECTORY),
-            env=env,
-            stdout=f,
-            stderr=subprocess.STDOUT,
-        )
+
+    subprocess.Popen(
+        ["pnpm", "dev"],
+        cwd=os.fspath(SIMPLE_AUTH_MANAGER_UI_DIRECTORY),
+        env=env,
+        stdout=open(SIMPLE_AUTH_MANAGER_UI_ASSET_OUT_DEV_MODE_FILE, "a"),
+        stderr=subprocess.STDOUT,
+    )