diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/site/ru/grouple/GroupleParser.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/site/ru/grouple/GroupleParser.kt
index f77d83a7..7660e495 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/site/ru/grouple/GroupleParser.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/site/ru/grouple/GroupleParser.kt
@@ -131,6 +131,8 @@ internal abstract class GroupleParser(
 		if (chaptersList == null && root.getElementsContainingOwnText(NO_CHAPTERS).isEmpty()) {
 			root.parseFailed("No chapters found")
 		}
+		val hashRegex = Regex("window.user_hash\\s*=\\s*\'([^\']+)\'")
+		val userHash = doc.select("script").firstNotNullOfOrNull { it.html().findGroupValue(hashRegex) }
 		return manga.copy(
 			source = newSource,
 			title = doc.metaValue("name") ?: manga.title,
@@ -153,7 +155,7 @@ internal abstract class GroupleParser(
 			chapters = chaptersList?.select("a.chapter-link")
 				?.flatMapChapters(reversed = true) { a ->
 					val tr = a.selectFirstParent("tr") ?: return@flatMapChapters emptyList()
-					val href = a.attrAsRelativeUrl("href")
+					val href = a.attrAsRelativeUrl("href").setQueryParam("d", userHash)
 					val number = tr.attr("data-num").toFloatOrNull()?.div(10f) ?: 0f
 					val volume = tr.attr("data-vol").toIntOrNull() ?: 0
 					if (translations.isNullOrEmpty() || a.attr("data-translations").isEmpty()) {
@@ -497,7 +499,8 @@ internal abstract class GroupleParser(
 		return result
 	}
 
-	private fun String.setQueryParam(name: String, value: String): String {
+	private fun String.setQueryParam(name: String, value: String?): String {
+		if (value == null) return this
 		return toAbsoluteUrl(domain)
 			.toHttpUrl()
 			.newBuilder()
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/util/String.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/util/String.kt
index 6d08e974..f6237441 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/util/String.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/util/String.kt
@@ -169,7 +169,9 @@ public fun String.substringBetweenLast(from: String, to: String, fallbackValue:
 	}
 }
 
-public fun String.find(regex: Regex) = regex.find(this)?.value
+public fun String.find(regex: Regex): String? = regex.find(this)?.value
+
+public fun String.findGroupValue(regex: Regex): String? = regex.find(this)?.groupValues?.getOrNull(1)
 
 public fun String.removeSuffix(suffix: Char): String {
 	if (lastOrNull() == suffix) {