diff --git a/mastodon/src/main/java/org/joinmastodon/android/api/requests/accounts/RegisterAccount.java b/mastodon/src/main/java/org/joinmastodon/android/api/requests/accounts/RegisterAccount.java
index 7656d6d4..62214523 100644
--- a/mastodon/src/main/java/org/joinmastodon/android/api/requests/accounts/RegisterAccount.java
+++ b/mastodon/src/main/java/org/joinmastodon/android/api/requests/accounts/RegisterAccount.java
@@ -4,21 +4,22 @@ import org.joinmastodon.android.api.MastodonAPIRequest;
 import org.joinmastodon.android.model.Token;
 
 public class RegisterAccount extends MastodonAPIRequest<Token>{
-	public RegisterAccount(String username, String email, String password, String locale, String reason){
+	public RegisterAccount(String username, String email, String password, String locale, String reason, String timezone){
 		super(HttpMethod.POST, "/accounts", Token.class);
-		setRequestBody(new Body(username, email, password, locale, reason));
+		setRequestBody(new Body(username, email, password, locale, reason, timezone));
 	}
 
 	private static class Body{
-		public String username, email, password, locale, reason;
+		public String username, email, password, locale, reason, timeZone;
 		public boolean agreement=true;
 
-		public Body(String username, String email, String password, String locale, String reason){
+		public Body(String username, String email, String password, String locale, String reason, String timeZone){
 			this.username=username;
 			this.email=email;
 			this.password=password;
 			this.locale=locale;
 			this.reason=reason;
+			this.timeZone=timeZone;
 		}
 	}
 }
diff --git a/mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/SignupFragment.java b/mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/SignupFragment.java
index 7f4fe256..8455100c 100644
--- a/mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/SignupFragment.java
+++ b/mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/SignupFragment.java
@@ -45,6 +45,7 @@ import org.jsoup.nodes.TextNode;
 import org.jsoup.select.NodeVisitor;
 import org.parceler.Parcels;
 
+import java.time.ZoneId;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -189,7 +190,7 @@ public class SignupFragment extends ToolbarFragment{
 			edit.setError(null);
 		}
 		errorFields.clear();
-		new RegisterAccount(username, email, password.getText().toString(), getResources().getConfiguration().locale.getLanguage(), reason.getText().toString())
+		new RegisterAccount(username, email, password.getText().toString(), getResources().getConfiguration().locale.getLanguage(), reason.getText().toString(), ZoneId.systemDefault().getId())
 				.setCallback(new Callback<>(){
 					@Override
 					public void onSuccess(Token result){