diff --git a/komga/src/main/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncController.kt b/komga/src/main/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncController.kt
index 8057cd0e..fcec13fd 100644
--- a/komga/src/main/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncController.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncController.kt
@@ -14,6 +14,7 @@ import org.gotson.komga.infrastructure.security.KomgaPrincipal
 import org.gotson.komga.interfaces.api.kosync.dto.DocumentProgressDto
 import org.gotson.komga.interfaces.api.kosync.dto.UserAuthenticationDto
 import org.springframework.http.HttpStatus
+import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.security.core.annotation.AuthenticationPrincipal
 import org.springframework.web.bind.annotation.GetMapping
@@ -29,7 +30,7 @@ import java.time.ZonedDateTime
 private val logger = KotlinLogging.logger {}
 
 @RestController
-@RequestMapping("/koreader", produces = ["application/vnd.koreader.v1+json"])
+@RequestMapping("/koreader", produces = [MediaType.APPLICATION_JSON_VALUE, "application/vnd.koreader.v1+json"])
 class KoreaderSyncController(
   private val bookRepository: BookRepository,
   private val mediaRepository: MediaRepository,
diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncControllerTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncControllerTest.kt
index a1e8521f..16011c5b 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncControllerTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/kosync/KoreaderSyncControllerTest.kt
@@ -7,9 +7,13 @@ import org.gotson.komga.domain.service.KomgaUserLifecycle
 import org.junit.jupiter.api.AfterAll
 import org.junit.jupiter.api.BeforeAll
 import org.junit.jupiter.api.Test
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.ValueSource
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.http.HttpHeaders
+import org.springframework.http.MediaType
 import org.springframework.test.web.servlet.MockMvc
 import org.springframework.test.web.servlet.get
 import org.springframework.test.web.servlet.post
@@ -68,4 +72,17 @@ class KoreaderSyncControllerTest(
         jsonPath("authorized") { value("OK") }
       }
   }
+
+  @ParameterizedTest
+  @ValueSource(strings = [MediaType.APPLICATION_JSON_VALUE, "application/vnd.koreader.v1+json"])
+  fun `given accept header when calling API user then returns OK`(acceptHeader: String) {
+    mockMvc
+      .get("/koreader/users/auth") {
+        header("x-auth-user", apiKey)
+        header(HttpHeaders.ACCEPT, acceptHeader)
+      }.andExpect {
+        status { isOk() }
+        jsonPath("authorized") { value("OK") }
+      }
+  }
 }