diff --git a/cmds/dumpstate/dumpstate.cpp b/cmds/dumpstate/dumpstate.cpp
index db2e392..eddb989 100644
--- a/cmds/dumpstate/dumpstate.cpp
+++ b/cmds/dumpstate/dumpstate.cpp
@@ -766,7 +766,7 @@
 
     std::vector<uint8_t> buffer(65536);
     while (1) {
-        ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer.data(), sizeof(buffer)));
+        ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer.data(), buffer.size()));
         if (bytes_read == 0) {
             break;
         } else if (bytes_read == -1) {