diff --git a/EncodingCXX.cxx b/EncodingCXX.cxx
index 7d9b3e4d83cd5e14032ea5c1960b5abac6b0ab95..597d4bd1947ea18dc3cd15db67465eaffe70b275 100644
--- a/EncodingCXX.cxx
+++ b/EncodingCXX.cxx
@@ -38,6 +38,7 @@
 // Windows API.
 #if defined(_WIN32)
 # include <windows.h>
+# include <shellapi.h>
 #endif
 
 namespace KWSYS_NAMESPACE