diff --git a/phpstan-baseline.php b/phpstan-baseline.php
index 471a422ea745..4d1cde2372b4 100644
--- a/phpstan-baseline.php
+++ b/phpstan-baseline.php
@@ -521,21 +521,6 @@
 	'count' => 8,
 	'path' => __DIR__ . '/system/Common.php',
 ];
-$ignoreErrors[] = [
-	'message' => '#^Function force_https\\(\\) has no return type specified\\.$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/Common.php',
-];
-$ignoreErrors[] = [
-	'message' => '#^Function helper\\(\\) has no return type specified\\.$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/Common.php',
-];
-$ignoreErrors[] = [
-	'message' => '#^Function timer\\(\\) has parameter \\$callable with no signature specified for callable\\.$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/Common.php',
-];
 $ignoreErrors[] = [
 	'message' => '#^Short ternary operator is not allowed\\. Use null coalesce operator if applicable or consider using long ternary\\.$#',
 	'count' => 2,
diff --git a/system/Common.php b/system/Common.php
index c964e10ea899..49c0f05af251 100644
--- a/system/Common.php
+++ b/system/Common.php
@@ -481,7 +481,7 @@ function force_https(
         int $duration = 31_536_000,
         ?RequestInterface $request = null,
         ?ResponseInterface $response = null
-    ) {
+    ): void {
         $request ??= Services::request();
 
         if (! $request instanceof IncomingRequest) {
@@ -590,7 +590,7 @@ function function_usable(string $functionName): bool
      *
      * @throws FileNotFoundException
      */
-    function helper($filenames)
+    function helper($filenames): void
     {
         static $loaded = [];
 
@@ -1139,6 +1139,8 @@ function stringify_attributes($attributes, bool $js = false): string
      * returns its return value if any.
      * Otherwise will start or stop the timer intelligently.
      *
+     * @phpstan-param (callable(): mixed)|null $callable
+     *
      * @return Timer
      */
     function timer(?string $name = null, ?callable $callable = null)