diff --git a/doc/README.developer b/doc/README.developer
index 55f2d41561..f38b0d159e 100644
--- a/doc/README.developer
+++ b/doc/README.developer
@@ -178,11 +178,6 @@ Wireshark that take format arguments, use G_GINT64_MODIFIER, for example:
 			"Sequence Number: %" G_GINT64_MODIFIER "u",
 			sequence_number);
 
-When using standard C routines, such as printf and scanf, use
-PRId64, PRIu64, PRIx64, PRIX64, and PRIo64; for example:
-
-   printf("Sequence Number: %" PRIu64 "\n", sequence_number);
-
 When specifying an integral constant that doesn't fit in 32 bits, don't
 use "LL" at the end of the constant - not all compilers use "LL" for
 that.  Instead, put the constant in a call to the "G_GINT64_CONSTANT()"