diff --git a/adb/client/adb_client.cpp b/adb/client/adb_client.cpp
index 9fa827d..5a7bc8d 100644
--- a/adb/client/adb_client.cpp
+++ b/adb/client/adb_client.cpp
@@ -259,7 +259,7 @@
         if (fd >= 0) {
             std::string version_string;
             if (!ReadProtocolString(fd, &version_string, error)) {
-                return -1;
+                return false;
             }
 
             ReadOrderlyShutdown(fd);