diff --git a/unoidl/source/sourcetreeprovider.cxx b/unoidl/source/sourcetreeprovider.cxx
index 246f6f01be41..e9d00940bb69 100644
--- a/unoidl/source/sourcetreeprovider.cxx
+++ b/unoidl/source/sourcetreeprovider.cxx
@@ -11,6 +11,7 @@
 
 #include <map>
 #include <vector>
+#include <cstring>
 
 #include "osl/file.h"
 #include "osl/file.hxx"