diff --git a/src/nfc_sets.cc b/src/nfc_sets.cc
index b8a7ef6..f62a799 100644
--- a/src/nfc_sets.cc
+++ b/src/nfc_sets.cc
@@ -3073,6 +3073,9 @@ const std::map<unsigned, std::pair<int,int>> NFC_Decompose = {
 {0x2FA1D, {0x2A600, -1}},
 };
 
+namespace pEp {
 std::map< std::pair<unsigned, unsigned>, unsigned> generate_nfc_compose();
-const std::map< std::pair<unsigned, unsigned>, unsigned> NFC_Compose = generate_nfc_compose();
+}
+
+const std::map< std::pair<unsigned, unsigned>, unsigned> NFC_Compose = pEp::generate_nfc_compose();