diff --git a/Clover/app/src/main/java/org/floens/chan/chan/ChanUrls.java b/Clover/app/src/main/java/org/floens/chan/chan/ChanUrls.java
index 3ac78be8..e39311df 100644
--- a/Clover/app/src/main/java/org/floens/chan/chan/ChanUrls.java
+++ b/Clover/app/src/main/java/org/floens/chan/chan/ChanUrls.java
@@ -43,7 +43,7 @@ public class ChanUrls {
     }
 
     public static String getCaptchaImageUrl(String challenge) {
-        return scheme + "://www.google.com/recaptcha/api2/payload?c=" + challenge;
+        return scheme + "://www.google.com/recaptcha/api2/payload?k=6Ldp2bsSAAAAAAJ5uyx_lx34lJeEpTLVkP5k04qc&c=" + challenge;
     }
 
     public static String getCaptchaFallback() {
diff --git a/docs/gcaptcha.txt b/docs/gcaptcha.txt
index 590789ea..580d6ab5 100644
--- a/docs/gcaptcha.txt
+++ b/docs/gcaptcha.txt
@@ -10,7 +10,7 @@ https://www.google.com/recaptcha/api/challenge?k=6Ldp2bsSAAAAAAJ5uyx_lx34lJeEpTL
 contains the key 'challenge'
 
 Now load the image
-https://www.google.com/recaptcha/api2/payload?c=CHALLENGE
+https://www.google.com/recaptcha/api2/payload?k=6Ldp2bsSAAAAAAJ5uyx_lx34lJeEpTLVkP5k04qc&c=CHALLENGE
 
 after the user has solved the image, do a POST to