diff --git a/ConfirmEdit_body.php b/ConfirmEdit_body.php
index e905640cf..0926cacd3 100644
--- a/ConfirmEdit_body.php
+++ b/ConfirmEdit_body.php
@@ -83,6 +83,7 @@ class SimpleCaptcha {
 		$captcha = $this->getCaptcha();
 		$index = $this->storeCaptcha( $captcha );
 		$resultArr['captcha']['type'] = 'simple';
+		$resultArr['captcha']['mime'] = 'text/plain';
 		$resultArr['captcha']['id'] = $index;
 		$resultArr['captcha']['question'] = $captcha['question'];
 	}
diff --git a/FancyCaptcha.class.php b/FancyCaptcha.class.php
index b560e712e..cf723d763 100644
--- a/FancyCaptcha.class.php
+++ b/FancyCaptcha.class.php
@@ -33,6 +33,7 @@ class FancyCaptcha extends SimpleCaptcha {
 		$index = $this->storeCaptcha( $info );
 		$title = Title::makeTitle( NS_SPECIAL, 'Captcha/image' );
 		$resultArr['captcha']['type'] = 'image';
+		$resultArr['captcha']['mime'] = 'image/png';
 		$resultArr['captcha']['id'] = $index;
 		$resultArr['captcha']['url'] = $title->getLocalUrl( 'wpCaptchaId=' . urlencode( $index ) );		
 	}
diff --git a/MathCaptcha.class.php b/MathCaptcha.class.php
index db506a335..66567e035 100644
--- a/MathCaptcha.class.php
+++ b/MathCaptcha.class.php
@@ -11,6 +11,7 @@ class MathCaptcha extends SimpleCaptcha {
 		list( $sum, $answer ) = $this->pickSum();
 		$index = $this->storeCaptcha( array('answer' => $answer ) );
 		$resultArr['captcha']['type'] = 'math';
+		$resultArr['captcha']['mime'] = 'text/tex';
 		$resultArr['captcha']['id'] = $index;
 		$resultArr['captcha']['question'] = $sum;
 	}