diff --git a/test/md2.cpp b/test/md2.cpp
index 852304ac..0583ca60 100644
--- a/test/md2.cpp
+++ b/test/md2.cpp
@@ -47,6 +47,7 @@ main (int, char **) {
     for (const auto &i: TESTS) {
         MD2 h;
         h.update (i.input, strlen (i.input));
+        h.finish ();
         auto out = h.digest ();
 
         if (out != i.output) {
diff --git a/test/md4.cpp b/test/md4.cpp
index c9e53f8e..c1d7509d 100644
--- a/test/md4.cpp
+++ b/test/md4.cpp
@@ -55,6 +55,7 @@ main (int, char**) {
     for (auto i: TESTS) {
         MD4 h;
         h.update (i.input, strlen (i.input));
+        h.finish ();
         auto out = h.digest ();
 
         if (out != i.output) {
diff --git a/test/md5.cpp b/test/md5.cpp
index abd82ad9..3d4c016d 100644
--- a/test/md5.cpp
+++ b/test/md5.cpp
@@ -46,6 +46,7 @@ main (int, char**) {
     for (auto i: TESTS) {
         MD5 h;
         h.update (i.input, strlen (i.input));
+        h.finish ();
         auto out = h.digest ();
 
         if (out != i.output) {