diff --git a/config.h b/config.h
index f4fbc677..e7c15507 100644
--- a/config.h
+++ b/config.h
@@ -7,6 +7,8 @@
 
 #define WITH_CONTIKI 1
 
+#define uthash_fatal(msg) return
+
 #define DEBUG 0
 #define HAVE_STRNLEN 1
 #define HAVE_SNPRINTF 1
diff --git a/uthash.h b/uthash.h
index a4bdc18a..6f0e064d 100644
--- a/uthash.h
+++ b/uthash.h
@@ -64,7 +64,9 @@ typedef unsigned int uint32_t;
 
 #define UTHASH_VERSION 1.9.3
 
+#ifndef uthash_fatal
 #define uthash_fatal(msg) exit(-1)        /* fatal error (out of memory,etc) */
+#endif
 #define uthash_malloc(sz) malloc(sz)      /* malloc fcn                      */
 #define uthash_free(ptr,sz) free(ptr)     /* free fcn                        */