diff --git a/src/io/FileDescriptor.hxx b/src/io/FileDescriptor.hxx
index 64ae824ce..edd009440 100644
--- a/src/io/FileDescriptor.hxx
+++ b/src/io/FileDescriptor.hxx
@@ -37,10 +37,6 @@ public:
 		return fd == other.fd;
 	}
 
-	constexpr bool operator!=(FileDescriptor other) const noexcept {
-		return !(*this == other);
-	}
-
 	constexpr bool IsDefined() const noexcept {
 		return fd >= 0;
 	}