diff --git a/testsc.c b/testsc.c
index 132270ca..a977084e 100644
--- a/testsc.c
+++ b/testsc.c
@@ -1414,6 +1414,11 @@ TESTLIST(STRUCT_TEST)
 #undef STRUCT_TEST
 };
 
+void dputs(const char *buf)
+{
+    fputs(buf, stderr);
+}
+
 int main(int argc, char **argv)
 {
     bool doing_opts = true;
diff --git a/testzlib.c b/testzlib.c
index 95419e9a..0e7b424b 100644
--- a/testzlib.c
+++ b/testzlib.c
@@ -24,6 +24,11 @@ void out_of_memory(void)
     exit(1);
 }
 
+void dputs(const char *buf)
+{
+    fputs(buf, stderr);
+}
+
 int main(int argc, char **argv)
 {
     unsigned char buf[16], *outbuf;