diff --git a/src/field_ids.cpp b/src/field_ids.cpp
index d197f8d..52fb48c 100644
--- a/src/field_ids.cpp
+++ b/src/field_ids.cpp
@@ -5,6 +5,8 @@ namespace duckdb {
 
 namespace avro {
 
+constexpr const char *FieldID::DUCKDB_FIELD_ID;
+
 FieldID::FieldID() : set(false) {
 }