diff --git a/cmds/installd/utils.cpp b/cmds/installd/utils.cpp
index 7fa356f..462d004 100644
--- a/cmds/installd/utils.cpp
+++ b/cmds/installd/utils.cpp
@@ -656,7 +656,7 @@
 int64_t data_disk_free(const std::string& data_path) {
     struct statvfs sfs;
     if (statvfs(data_path.c_str(), &sfs) == 0) {
-        return sfs.f_bavail * sfs.f_frsize;
+        return static_cast<int64_t>(sfs.f_bavail) * sfs.f_frsize;
     } else {
         PLOG(ERROR) << "Couldn't statvfs " << data_path;
         return -1;