diff --git a/toolchain/toolchain-crosstool-ng/crosstool-ng.mk b/toolchain/toolchain-crosstool-ng/crosstool-ng.mk
index 97224a1d9a..92ed93272e 100644
--- a/toolchain/toolchain-crosstool-ng/crosstool-ng.mk
+++ b/toolchain/toolchain-crosstool-ng/crosstool-ng.mk
@@ -245,6 +245,13 @@ else
 CTNG_FIX_DOT_CONFIG_LIBC_SED += s:^(UCLIBC_HAS_LFS)=.*:\# \1 is not set:;
 endif
 
+# Handle the IPv6 option
+ifneq ($(call qstrip,$(BR2_INET_IPV6)),)
+CTNG_FIX_DOT_CONFIG_LIBC_SED += s:^\# (UCLIBC_HAS_IPV6) is not set:\1=y:;
+else
+CTNG_FIX_DOT_CONFIG_LIBC_SED += s:^(UCLIBC_HAS_IPV6)=.*:\# \1 is not set:;
+endif
+
 # Instruct CT-NG's .config where to find the uClibc's .config
 CTNG_FIX_DOT_CONFIG_PATHS_SED += s:^(CT_LIBC_UCLIBC_CONFIG_FILE)=.*:\1="$(CTNG_DIR)/libc.config":;