diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3bafded..dc54495 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [1.3.1] - 2019-11-29
+
+### Fixed
+- Fix query string hash with false parameters (pull request #11, @jvanraaij)
+
 ## [1.3.0] - 2019-10-27
 
 ### Added
@@ -66,7 +71,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 - Package keywords at composer.json
 
-[Unreleased]: https://github.com/brezzhnev/atlassian-connect-core/compare/v1.3.0...HEAD
+[Unreleased]: https://github.com/brezzhnev/atlassian-connect-core/compare/v1.3.1...HEAD
+[1.3.1]: https://github.com/brezzhnev/atlassian-connect-core/compare/v1.3.0...v1.3.1
 [1.3.0]: https://github.com/brezzhnev/atlassian-connect-core/compare/v1.2.4...v1.3.0
 [1.2.4]: https://github.com/brezzhnev/atlassian-connect-core/compare/v1.2.3...v1.2.4
 [1.2.3]: https://github.com/brezzhnev/atlassian-connect-core/compare/v1.2.2...v1.2.3
diff --git a/src/Http/Auth/QSH.php b/src/Http/Auth/QSH.php
index 3594875..194491f 100644
--- a/src/Http/Auth/QSH.php
+++ b/src/Http/Auth/QSH.php
@@ -192,12 +192,9 @@ protected function buildQuery(array $params): string
         $pieces = [];
 
         foreach ($this->encodeQueryParams($params) as $param => $values) {
-            $value = implode(',', $values);
-
-            $pieces[] = implode('=', !$value
-                ? [$param]
-                : [$param, $value]
-            );
+            $pieces[] = $values
+                ? implode('=', [$param, implode(',', $values)])
+                : $param;
         }
 
         return implode('&', array_filter($pieces));
diff --git a/tests/Auth/QSHTest.php b/tests/Auth/QSHTest.php
index e1fb370..2b7cfc2 100644
--- a/tests/Auth/QSHTest.php
+++ b/tests/Auth/QSHTest.php
@@ -61,6 +61,10 @@ public function testCanonicalQuery()
         $this->assertCanonicalQuery('a=x1&a=x10&b=y1&b=y10', 'a=x1,x10&b=y1,y10');
         $this->assertCanonicalQuery('a=another+one&a=one+string&b=and+yet+more&b=more+here', 'a=another%20one,one%20string&b=and%20yet%20more,more%20here');
         $this->assertCanonicalQuery('a=1%2C2%2C3&a=4%2C5%2C6&b=a%2Cb%2Cc&b=d%2Ce%2Cf', 'a=1%2C2%2C3,4%2C5%2C6&b=a%2Cb%2Cc,d%2Ce%2Cf');
+
+        // Parameter values that might evaluate weirdly in PHP
+        $this->assertCanonicalQuery('empty=', 'empty=');
+        $this->assertCanonicalQuery('since=0', 'since=0');
     }
 
     /**