diff --git a/trunk/src/common/util.h b/trunk/src/common/util.h
index 555aa6b050..eeaddd994a 100644
--- a/trunk/src/common/util.h
+++ b/trunk/src/common/util.h
@@ -57,7 +57,7 @@
 #endif
 
 #ifdef MS_WINDOWS
-#define tor_close_socket(s) socketclose(s)
+#define tor_close_socket(s) closesocket(s)
 #else
 #define tor_close_socket(s) close(s)
 #endif