diff --git a/mcs/class/Makefile b/mcs/class/Makefile
index bddcc1be0d3f..02bd9f2a85f5 100644
--- a/mcs/class/Makefile
+++ b/mcs/class/Makefile
@@ -199,7 +199,7 @@ orbis_dirs_parallel := \
 	$(filter-out Microsoft.CSharp Mono.Data.Sqlite,$(mobile_common_dirs_parallel))
 
 unityaot_dirs_parallel := \
-	$(filter-out Microsoft.CSharp,$(mobile_common_dirs_parallel))
+	$(mobile_common_dirs_parallel)
 
 xammac_4_5_dirs_parallel := \
 	Mono.Security \