diff --git a/pkgs/by-name/po/postfix/package.nix b/pkgs/by-name/po/postfix/package.nix
index ef6bdb60057c..801c569f24ff 100644
--- a/pkgs/by-name/po/postfix/package.nix
+++ b/pkgs/by-name/po/postfix/package.nix
@@ -8,6 +8,7 @@
   openssl,
   cyrus_sasl,
   libnsl,
+  lmdb,
   coreutils,
   findutils,
   gnugrep,
@@ -39,6 +40,7 @@ let
       "-DUSE_CYRUS_SASL"
       "-I${cyrus_sasl'.dev}/include/sasl"
       "-DHAS_DB_BYPASS_MAKEDEFS_CHECK"
+      "-DHAS_LMDB"
       # Fix build with gcc15, no upstream fix for stable releases:
       # https://www.mail-archive.com/postfix-devel@postfix.org/msg01270.html
       "-std=gnu17"
@@ -58,11 +60,12 @@ let
   );
   auxlibs = lib.concatStringsSep " " (
     [
+      "-lcrypto"
       "-ldb"
+      "-llmdb"
       "-lnsl"
       "-lresolv"
       "-lsasl2"
-      "-lcrypto"
       "-lssl"
     ]
     ++ lib.optional withPgSQL "-lpq"
@@ -87,11 +90,12 @@ stdenv.mkDerivation (finalAttrs: {
     m4
   ];
   buildInputs = [
-    db
-    openssl
     cyrus_sasl'
+    db
     icu
     libnsl
+    lmdb
+    openssl
     pcre2
   ]
   ++ lib.optional withPgSQL libpq