diff --git a/src/pdumper.c b/src/pdumper.c
index c00f8a0af5..c4d48cc575 100644
--- a/src/pdumper.c
+++ b/src/pdumper.c
@@ -326,10 +326,16 @@ dump_reloc_set_offset (struct dump_reloc *reloc, dump_off offset)
 static void
 dump_fingerprint (const char *label, unsigned char const *xfingerprint)
 {
-  fprintf (stderr, "%s: ", label);
+  /* The maximum length of LABEL.  If you change code that calls this
+     function you may need to change this value.  */
+  enum { max_label_length = sizeof "desired fingerprint" - 1 };
+
+  char buf[max_label_length + sizeof ": \n" + 2 * 32];
+  int buflen = sprintf (buf, "%s: ", label);
   for (int i = 0; i < 32; ++i)
-    fprintf (stderr, "%02x", (unsigned) xfingerprint[i]);
-  fprintf (stderr, "\n");
+    buflen += sprintf (buf + buflen, "%02x", (unsigned) xfingerprint[i]);
+  buf[buflen++] = '\n';
+  fwrite (buf, 1, buflen, stderr);
 }
 
 /* Format of an Emacs portable dump file.  All offsets are relative to