diff --git a/cpu/esp8266/include/cpu_conf.h b/cpu/esp8266/include/cpu_conf.h
index f8eb723dd9d5f74e6a9e74df8862244beb4f5c5e..987ca995eb18e20792ed95679956ab28fc5be3ad 100644
--- a/cpu/esp8266/include/cpu_conf.h
+++ b/cpu/esp8266/include/cpu_conf.h
@@ -47,6 +47,9 @@ extern "C" {
 #define THREAD_STACKSIZE_MAIN         (3072)
 #endif
 
+#ifndef GNRC_IPV6_STACK_SIZE
+#define GNRC_IPV6_STACK_SIZE          (1536)
+#endif
 #ifndef GNRC_PKTDUMP_STACKSIZE
 #define GNRC_PKTDUMP_STACKSIZE        (THREAD_STACKSIZE_DEFAULT)
 #endif
@@ -74,6 +77,9 @@ extern "C" {
 #define THREAD_STACKSIZE_MAIN         (3072)
 #endif
 
+#ifndef GNRC_IPV6_STACK_SIZE
+#define GNRC_IPV6_STACK_SIZE          (1536)
+#endif
 #ifndef GNRC_PKTDUMP_STACKSIZE
 #define GNRC_PKTDUMP_STACKSIZE        (THREAD_STACKSIZE_DEFAULT)
 #endif