diff --git a/bacnet-stack/demo/ucov/Makefile b/bacnet-stack/demo/ucov/Makefile
index a6ce0f3e..be96ab7d 100644
--- a/bacnet-stack/demo/ucov/Makefile
+++ b/bacnet-stack/demo/ucov/Makefile
@@ -47,7 +47,7 @@ SRCS = main.c \
        $(BACNET_ROOT)/bacstr.c \
        $(BACNET_ROOT)/bactext.c \
        $(BACNET_ROOT)/indtext.c \
-       $(BACNET_ROOT)/bigend.c \
+       $(BACNET_ROOT)/datetime.c \
        $(BACNET_ROOT)/whois.c \
        $(BACNET_ROOT)/iam.c \
        $(BACNET_ROOT)/datalink.c \
diff --git a/bacnet-stack/demo/ucov/makefile.b32 b/bacnet-stack/demo/ucov/makefile.b32
index e81acd88..b536f1a7 100644
--- a/bacnet-stack/demo/ucov/makefile.b32
+++ b/bacnet-stack/demo/ucov/makefile.b32
@@ -31,7 +31,7 @@ SRCS = main.c \
        ..\..\bacstr.c \
        ..\..\bactext.c \
        ..\..\indtext.c \
-       ..\..\bigend.c \
+       ..\..\datetime.c \
        ..\..\whois.c \
        ..\..\iam.c \
        ..\..\rp.c \