diff --git a/index.php b/index.php
index 31142c90..24aad88c 100644
--- a/index.php
+++ b/index.php
@@ -688,12 +688,12 @@ public function verifyIntegrity() {
 -----END CERTIFICATE-----
 EOF;
 
-		$validSignature = (bool)openssl_verify(
+		$validSignature = openssl_verify(
 			file_get_contents($this->getDownloadedFilePath()),
 			base64_decode($response['signature']),
 			$certificate,
 			OPENSSL_ALGO_SHA512
-		);
+		) === 1;
 
 		if ($validSignature === false) {
 			throw new \Exception('Signature of update is not valid');
diff --git a/lib/Updater.php b/lib/Updater.php
index 8e5825a8..06f65e8b 100644
--- a/lib/Updater.php
+++ b/lib/Updater.php
@@ -652,12 +652,12 @@ public function verifyIntegrity() {
 -----END CERTIFICATE-----
 EOF;
 
-		$validSignature = (bool)openssl_verify(
+		$validSignature = openssl_verify(
 			file_get_contents($this->getDownloadedFilePath()),
 			base64_decode($response['signature']),
 			$certificate,
 			OPENSSL_ALGO_SHA512
-		);
+		) === 1;
 
 		if ($validSignature === false) {
 			throw new \Exception('Signature of update is not valid');