diff --git a/wsutil/unicode-utils.c b/wsutil/unicode-utils.c
index 6a5f0b01b3..1d799313f9 100644
--- a/wsutil/unicode-utils.c
+++ b/wsutil/unicode-utils.c
@@ -40,6 +40,7 @@ ws_utf8_char_len(guint8 ch)
 #ifdef _WIN32
 
 #include <shellapi.h>
+#include <strsafe.h>
 
 /** @file
  * Unicode utilities (internal interface)