diff --git a/epan/ftypes/ftype-integer.c b/epan/ftypes/ftype-integer.c
index d00f3097ed..bd3cfd5943 100644
--- a/epan/ftypes/ftype-integer.c
+++ b/epan/ftypes/ftype-integer.c
@@ -321,7 +321,7 @@ integer64_repr_len(fvalue_t *fv _U_, ftrepr_t rtype _U_)
 static void
 integer64_to_repr(fvalue_t *fv, ftrepr_t rtype _U_, char *buf)
 {
-	sprintf(buf, "%" PRId64, fv->value.integer64);
+	sprintf(buf, "%" G_GINT64_MODIFIER "d", fv->value.integer64);
 }
 
 static int
@@ -333,7 +333,7 @@ uinteger64_repr_len(fvalue_t *fv _U_, ftrepr_t rtype _U_)
 static void
 uinteger64_to_repr(fvalue_t *fv, ftrepr_t rtype _U_, char *buf)
 {
-	sprintf(buf, "%" PRIu64, fv->value.integer64);
+	sprintf(buf, "%" G_GINT64_MODIFIER "u", fv->value.integer64);
 }
 
 static gboolean