diff --git a/ChangeLog b/ChangeLog
index 980c697d4f728863ccbd2043caffae250b076731..cee3e546f2b54f667943ad88ad3122ad7e64f81c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2019-01-08  Niels Möller  <nisse@lysator.liu.se>
+
+	* sha512-compress.c: Add missing include of sha2-internal.h.
+
 2018-12-26  Niels Möller  <nisse@lysator.liu.se>
 
 	* examples/hogweed-benchmark.c (make_openssl_rsa_ctx): New helper
diff --git a/sha512-compress.c b/sha512-compress.c
index 24007f288e5b60b2ac53c3f12610351d1086f280..f6d8a616da9377f0c1f8a5cac089d68490cae306 100644
--- a/sha512-compress.c
+++ b/sha512-compress.c
@@ -53,6 +53,7 @@
 #include <string.h>
 
 #include "sha2.h"
+#include "sha2-internal.h"
 
 #include "macros.h"