diff --git a/src/Filelists.mk b/src/Filelists.mk
index 2d3d2be7..13d524b7 100644
--- a/src/Filelists.mk
+++ b/src/Filelists.mk
@@ -43,6 +43,7 @@ COREFILES=$(LWIPDIR)/core/init.c \
 	$(LWIPDIR)/core/stats.c \
 	$(LWIPDIR)/core/sys.c \
 	$(LWIPDIR)/core/altcp.c \
+	$(LWIPDIR)/core/altcp_alloc.c \
 	$(LWIPDIR)/core/altcp_tcp.c \
 	$(LWIPDIR)/core/tcp.c \
 	$(LWIPDIR)/core/tcp_in.c \