diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc
index 6806c3e4a..8b72977d6 100644
--- a/src/libstore/binary-cache-store.cc
+++ b/src/libstore/binary-cache-store.cc
@@ -18,11 +18,8 @@ BinaryCacheStore::BinaryCacheStore(std::shared_ptr<Store> localStore,
     const Path & secretKeyFile)
     : localStore(localStore)
 {
-    if (secretKeyFile != "") {
+    if (secretKeyFile != "")
         secretKey = std::unique_ptr<SecretKey>(new SecretKey(readFile(secretKeyFile)));
-        publicKeys = std::unique_ptr<PublicKeys>(new PublicKeys);
-        publicKeys->emplace(secretKey->name, secretKey->toPublicKey());
-    }
 
     StringSink sink;
     sink << narVersionMagic1;
@@ -213,11 +210,6 @@ std::shared_ptr<ValidPathInfo> BinaryCacheStore::queryPathInfoUncached(const Pat
 
     stats.narInfoRead++;
 
-    if (publicKeys) {
-        if (!narInfo->checkSignatures(*publicKeys))
-            throw Error(format("no good signature on NAR info file ‘%1%’") % narInfoFile);
-    }
-
     return std::shared_ptr<NarInfo>(narInfo);
 }
 
diff --git a/src/libstore/binary-cache-store.hh b/src/libstore/binary-cache-store.hh
index 4e4346a43..b732abc38 100644
--- a/src/libstore/binary-cache-store.hh
+++ b/src/libstore/binary-cache-store.hh
@@ -16,7 +16,6 @@ class BinaryCacheStore : public Store
 private:
 
     std::unique_ptr<SecretKey> secretKey;
-    std::unique_ptr<PublicKeys> publicKeys;
 
     std::shared_ptr<Store> localStore;