diff --git a/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt b/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt
index ec4e2f9de000e..50629d9d486c0 100644
--- a/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt
+++ b/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt
@@ -254,6 +254,7 @@ interface FossIdRestService {
     suspend fun listSnippets(@Body body: PostRequestBody): PolymorphicResponseBody<Snippet>
 
     @POST("api.php")
+    @Headers("$READ_TIMEOUT_HEADER:${5 * 60 * 1000}")
     suspend fun listMatchedLines(@Body body: PostRequestBody): EntityResponseBody<MatchedLines>
 
     @POST("api.php")