diff --git a/package/libnspr/libnspr.mk b/package/libnspr/libnspr.mk
index c2cc996851..689caa424c 100644
--- a/package/libnspr/libnspr.mk
+++ b/package/libnspr/libnspr.mk
@@ -12,6 +12,8 @@ LIBNSPR_INSTALL_STAGING = YES
 LIBNSPR_CONF_ENV = HOST_CFLAGS="-g -O2" \
 		   HOST_LDFLAGS="-lc"
 # NSPR mixes up --build and --host
-LIBNSPR_CONF_OPT = --host=$(GNU_HOST_NAME)
+LIBNSPR_CONF_OPT  = --host=$(GNU_HOST_NAME)
+LIBNSPR_CONF_OPT += --$(if $(BR2_ARCH_IS_64),en,dis)able-64bit
+LIBNSPR_CONF_OPT += --$(if $(BR2_INET_IPV6),en,dis)able-ipv6
 
 $(eval $(autotools-package))