diff --git a/package/libjson/libjson.mk b/package/libjson/libjson.mk
index d04ddc40f3..73268c9ccf 100644
--- a/package/libjson/libjson.mk
+++ b/package/libjson/libjson.mk
@@ -11,7 +11,7 @@ LIBJSON_INSTALL_STAGING = YES
 LIBJSON_LICENSE = BSD-2-Clause
 LIBJSON_LICENSE_FILES = License.txt
 
-LIBJSON_CXXFLAGS = $(TARGET_CFLAGS) -DNDEBUG
+LIBJSON_CXXFLAGS = $(TARGET_CFLAGS) -DNDEBUG -std=c++11
 
 ifeq ($(BR2_STATIC_LIBS),y)
 LIBJSON_MAKE_OPTS += SHARED=0