diff --git a/src/OTP.php b/src/OTP.php
index 4765d49..7e68dfc 100644
--- a/src/OTP.php
+++ b/src/OTP.php
@@ -100,7 +100,7 @@ protected function generateURI(string $type, array $options): string
         $this->hasColon($label) === false || throw new InvalidArgumentException('Label must not contain a colon.');
         $options = [...$options, ...$this->getParameters()];
         $this->filterOptions($options);
-        $params = str_replace(['+', '%7E'], ['%20', '~'], http_build_query($options));
+        $params = str_replace(['+', '%7E'], ['%20', '~'], http_build_query($options, arg_separator: '&'));
 
         return sprintf(
             'otpauth://%s/%s?%s',
diff --git a/tests/TOTPTest.php b/tests/TOTPTest.php
index d110940..c868a75 100644
--- a/tests/TOTPTest.php
+++ b/tests/TOTPTest.php
@@ -109,6 +109,21 @@ public function getProvisioningUri(): void
         );
     }
 
+    /**
+     * @test
+     */
+    public function getProvisioningUriWithNonDefaultArgSeperator(): void
+    {
+        $otp = self::createTOTP(6, 'sha1', 30);
+
+        ini_set('arg_separator.output', '&');
+
+        static::assertSame(
+            'otpauth://totp/My%20Project%3Aalice%40foo.bar?issuer=My%20Project&secret=JDDK4U6G3BJLEZ7Y',
+            $otp->getProvisioningUri()
+        );
+    }
+
     /**
      * @param positive-int $timestamp
      * @param positive-int $period