diff --git a/package/cloop/cloop.mk b/package/cloop/cloop.mk
index ad50d0a94a..585f422ce3 100644
--- a/package/cloop/cloop.mk
+++ b/package/cloop/cloop.mk
@@ -13,7 +13,8 @@ CLOOP_LICENSE_FILES = README advancecomp-1.15/COPYING
 HOST_CLOOP_DEPENDENCIES = host-zlib
 
 define HOST_CLOOP_BUILD_CMDS
-	$(HOST_CONFIGURE_OPTS) $(MAKE1) -C $(@D) APPSONLY=yes
+	$(HOST_CONFIGURE_OPTS) $(MAKE1) -C $(@D) APPSONLY=yes \
+		CFLAGS="$(HOST_CFLAGS) -D_GNU_SOURCE"
 endef
 
 define HOST_CLOOP_INSTALL_CMDS