diff --git a/H/YapHeap.h b/H/YapHeap.h
index 9afeeb99b..05cb2ded1 100644
--- a/H/YapHeap.h
+++ b/H/YapHeap.h
@@ -18,6 +18,10 @@
 #ifndef HEAP_H
 #define HEAP_H 1
 
+#if LOW_PROF
+#include <stdio.h>
+#endif
+
 #if defined(THREADS)
 #define RINFO rinfo[worker_id]
 #else