diff --git a/coap_config.h.contiki b/coap_config.h.contiki
index 43bef3a4ed..87fdbf077a 100644
--- a/coap_config.h.contiki
+++ b/coap_config.h.contiki
@@ -56,6 +56,7 @@
 
 #define HAVE_STRNLEN 1
 #define HAVE_SNPRINTF 1
+#define HAVE_STRINGS_H 1
 
 /* there is no file-oriented output */
 #define COAP_DEBUG_FD NULL
@@ -120,7 +121,7 @@ typedef void FILE;
 # endif /* UIP_CONF_BYTE_ORDER */
 #endif /* BYTE_ORDER */
 
-/* Define assert() as emtpy directive unless HAVE_ASSERT_H is given. */
+/* Define assert() as empty directive unless HAVE_ASSERT_H is given. */
 #ifndef HAVE_ASSERT_H
 # define assert(x)
 #endif