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diff --git a/src/heap.h b/src/heap.h
index 7644356b..f2dc8697 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -23,6 +23,8 @@
 /* This module implements a priority queue as a heap as described in
    Knuth 5.2.3.  This is a first-in-smallest-out priority queue. */
 
+#include <stddef.h>
+
 /* One element of a heap. */
 struct heap_elem
   {