diff --git a/src/wallet/bdb.cpp b/src/wallet/bdb.cpp
index d74950c5b1..69a0201d4a 100644
--- a/src/wallet/bdb.cpp
+++ b/src/wallet/bdb.cpp
@@ -29,6 +29,8 @@
 #endif
 #endif
 
+static_assert(BDB_DB_FILE_ID_LEN == DB_FILE_ID_LEN, "DB_FILE_ID_LEN should be 20.");
+
 namespace wallet {
 namespace {
 
diff --git a/src/wallet/bdb.h b/src/wallet/bdb.h
index 0470a3183a..f9b0b7601d 100644
--- a/src/wallet/bdb.h
+++ b/src/wallet/bdb.h
@@ -25,10 +25,14 @@
 
 struct bilingual_str;
 
+// This constant was introduced in BDB 4.0.14 and has never changed, but there
+// is a belt-and-suspenders check in the cpp file just in case.
+#define BDB_DB_FILE_ID_LEN 20 /* Unique file ID length. */
+
 namespace wallet {
 
 struct WalletDatabaseFileId {
-    uint8_t value[DB_FILE_ID_LEN];
+    uint8_t value[BDB_DB_FILE_ID_LEN];
     bool operator==(const WalletDatabaseFileId& rhs) const;
 };