diff --git a/src/parallel_io.c b/src/parallel_io.c
index d7437269318ac424684cb4d8bb273628d8e5da60..6e62f2245a32d5685caad02ce5e51cfe09a711c1 100644
--- a/src/parallel_io.c
+++ b/src/parallel_io.c
@@ -36,6 +36,7 @@
 #include "parallel_io.h"
 
 /* Local includes. */
+#include "allocation.h"
 #include "common_io.h"
 #include "dimension.h"
 #include "engine.h"