diff --git a/arch/sim/src/Makefile b/arch/sim/src/Makefile
index 6f39c907b3..2db14558ed 100644
--- a/arch/sim/src/Makefile
+++ b/arch/sim/src/Makefile
@@ -194,8 +194,10 @@ endif
 ifeq ($(CONFIG_RPTUN),y)
   CSRCS += up_rptun.c
   HOSTSRCS += up_shmem.c
+ifneq ($(CONFIG_HOST_MACOS),y)
   STDLIBS += -lrt
 endif
+endif
 
 ifeq ($(CONFIG_FS_HOSTFS),y)
 ifneq ($(CONFIG_FS_HOSTFS_RPMSG),y)