diff --git a/keystore/IKeystoreService.cpp b/keystore/IKeystoreService.cpp
index 9d19b46..519b78c 100644
--- a/keystore/IKeystoreService.cpp
+++ b/keystore/IKeystoreService.cpp
@@ -1453,7 +1453,7 @@
                 reply->writeInt32(outSize);
                 void* buf = reply->writeInplace(outSize);
                 memcpy(buf, out, outSize);
-                free(out);
+                delete[] reinterpret_cast<uint8_t*>(out);
             } else {
                 reply->writeInt32(-1);
             }