diff --git a/src/PSUEvent.cpp b/src/PSUEvent.cpp
index 6d2a3e6..cc7374c 100644
--- a/src/PSUEvent.cpp
+++ b/src/PSUEvent.cpp
@@ -175,7 +175,7 @@
     responseStream.clear();
     inputDev.close();
     int fd = open(path.c_str(), O_RDONLY);
-    if (fd <= 0)
+    if (fd < 0)
     {
         return;
     }