diff --git a/client/cs_trickle.cpp b/client/cs_trickle.cpp
index 653427268c..bc480e0d1b 100644
--- a/client/cs_trickle.cpp
+++ b/client/cs_trickle.cpp
@@ -19,6 +19,9 @@
 
 #ifdef _WIN32
 #include "boinc_win.h"
+#ifdef _MSC_VER
+#define strdup _strdup
+#endif
 #else
 #include "config.h"
 #include <cstring>