diff --git a/src/if_ole.cpp b/src/if_ole.cpp
index ca82182..ff9e371 100644
--- a/src/if_ole.cpp
+++ b/src/if_ole.cpp
@@ -91,6 +91,7 @@
  */
 # ifndef KEY_WOW64_64KEY
 #  define KEY_WOW64_64KEY 0x0100
+#  define RegDeleteKeyEx(a, b, c, d) RegDeleteKey(a, b)
 # endif
 
 /*****************************************************************************