diff --git a/core/Command/Base.php b/core/Command/Base.php
index 0af5981e942..b915ae2ae4a 100644
--- a/core/Command/Base.php
+++ b/core/Command/Base.php
@@ -149,7 +149,7 @@ class Base extends Command implements CompletionAwareInterface {
 		$this->interrupted = true;
 	}
 
-	public function run(InputInterface $input, OutputInterface $output) {
+	public function run(InputInterface $input, OutputInterface $output): int {
 		// check if the php pcntl_signal functions are accessible
 		$this->php_pcntl_signal = function_exists('pcntl_signal');
 		if ($this->php_pcntl_signal) {
diff --git a/lib/private/Console/TimestampFormatter.php b/lib/private/Console/TimestampFormatter.php
index da1b7ba48dd..0254bff2b32 100644
--- a/lib/private/Console/TimestampFormatter.php
+++ b/lib/private/Console/TimestampFormatter.php
@@ -41,7 +41,7 @@ class TimestampFormatter implements OutputFormatterInterface {
 	 *
 	 * @return bool true if the output will decorate messages, false otherwise
 	 */
-	public function isDecorated() {
+	public function isDecorated(): bool {
 		return $this->formatter->isDecorated();
 	}
 
@@ -61,7 +61,7 @@ class TimestampFormatter implements OutputFormatterInterface {
 	 * @param string $name
 	 * @return bool
 	 */
-	public function hasStyle($name) {
+	public function hasStyle($name): bool {
 		return $this->formatter->hasStyle($name);
 	}
 
@@ -72,7 +72,7 @@ class TimestampFormatter implements OutputFormatterInterface {
 	 * @return OutputFormatterStyleInterface
 	 * @throws \InvalidArgumentException When style isn't defined
 	 */
-	public function getStyle($name) {
+	public function getStyle($name): OutputFormatterStyleInterface {
 		return $this->formatter->getStyle($name);
 	}