diff --git a/package/network/services/uhttpd/Makefile b/package/network/services/uhttpd/Makefile
index 7c0989de1a..f4de987e65 100644
--- a/package/network/services/uhttpd/Makefile
+++ b/package/network/services/uhttpd/Makefile
@@ -107,6 +107,10 @@ define Package/uhttpd/conffiles
 /etc/uhttpd.key
 endef
 
+ifneq ($(CONFIG_USE_GLIBC),)
+  TARGET_CFLAGS += -D_DEFAULT_SOURCE
+endif
+
 TARGET_LDFLAGS += -lcrypt
 
 CMAKE_OPTIONS = -DTLS_SUPPORT=on
diff --git a/package/utils/ugps/Makefile b/package/utils/ugps/Makefile
index c1bc7cdd01..3662125c3a 100644
--- a/package/utils/ugps/Makefile
+++ b/package/utils/ugps/Makefile
@@ -32,6 +32,10 @@ endef
 
 TARGET_CFLAGS += -I$(STAGING_DIR)/usr/include
 
+ifneq ($(CONFIG_USE_GLIBC),)
+  TARGET_CFLAGS += -D_DEFAULT_SOURCE
+endif
+
 define Package/ugps/install
 	$(INSTALL_DIR) $(1)/usr/sbin $(1)/etc/init.d $(1)/etc/config
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/ugps $(1)/usr/sbin/