1 files changed, 4 insertions, 0 deletions
diff --git a/doc/examples/fpe.cpp b/doc/examples/fpe.cpp
index 73773994b..9b18d4879 100644
--- a/doc/examples/fpe.cpp
+++ b/doc/examples/fpe.cpp
@@ -18,6 +18,8 @@ using namespace Botan;
 #include <iostream>
 #include <stdexcept>
 
+namespace {
+
 byte luhn_checksum(u64bit cc_number)
    {
    byte sum = 0;
@@ -109,6 +111,8 @@ u64bit decrypt_cc_number(u64bit enc_cc,
    return cc_derank(dec_cc);
    }
 
+}
+
 int main(int argc, char* argv[])
    {
    LibraryInitializer init;