diff --git a/extras/fixture/src/unity_fixture_malloc_overrides.h b/extras/fixture/src/unity_fixture_malloc_overrides.h
index 1e10014..a19c1ea 100644
--- a/extras/fixture/src/unity_fixture_malloc_overrides.h
+++ b/extras/fixture/src/unity_fixture_malloc_overrides.h
@@ -8,6 +8,8 @@
 #ifndef UNITY_FIXTURE_MALLOC_OVERRIDES_H_
 #define UNITY_FIXTURE_MALLOC_OVERRIDES_H_
 
+#include <stddef.h>
+
 #define malloc  unity_malloc
 #define calloc  unity_calloc
 #define realloc unity_realloc
diff --git a/src/unity.c b/src/unity.c
index 4da60f8..b79f27a 100644
--- a/src/unity.c
+++ b/src/unity.c
@@ -5,6 +5,7 @@
 ============================================================================ */
 
 #include "unity.h"
+#include <stddef.h>
 
 #define UNITY_FAIL_AND_BAIL   { Unity.CurrentTestFailed  = 1; longjmp(Unity.AbortFrame, 1); }
 #define UNITY_IGNORE_AND_BAIL { Unity.CurrentTestIgnored = 1; longjmp(Unity.AbortFrame, 1); }