diff --git a/simgear/debug/LogEntry.cxx b/simgear/debug/LogEntry.cxx
index cb433086..5f8c5357 100644
--- a/simgear/debug/LogEntry.cxx
+++ b/simgear/debug/LogEntry.cxx
@@ -18,6 +18,7 @@
 
 #include "LogEntry.hxx"
 
+#include <cstring> // for strdup
 
 namespace simgear {