diff --git a/src/rsrv/Makefile b/src/rsrv/Makefile
index 841931df6..87d959f16 100644
--- a/src/rsrv/Makefile
+++ b/src/rsrv/Makefile
@@ -4,7 +4,6 @@ TOP=../..
 include $(TOP)/configure/CONFIG
 
 USR_INCLUDES = -I../../ca
-USR_CFLAGS += -UUNIX -DiocCore
 
 LIBSRCS += caserverio.c
 LIBSRCS += caservertask.c