diff --git a/toolchain/uClibc/uClibc-0.9.31.config b/toolchain/uClibc/uClibc-0.9.31.config
index 87f241111b..04d6895c0a 100644
--- a/toolchain/uClibc/uClibc-0.9.31.config
+++ b/toolchain/uClibc/uClibc-0.9.31.config
@@ -119,7 +119,7 @@ UCLIBC_HAS_BSD_ERR=y
 # UCLIBC_HAS_OBSOLETE_BSD_SIGNAL is not set
 # UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL is not set
 # UCLIBC_NTP_LEGACY is not set
-# UCLIBC_SV4_DEPRECATED is not set
+UCLIBC_SV4_DEPRECATED=y
 UCLIBC_HAS_REALTIME=y
 UCLIBC_HAS_ADVANCED_REALTIME=y
 UCLIBC_HAS_EPOLL=y