diff --git a/src/protocol.c b/src/protocol.c
index 05f3345..21a98b4 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -12,6 +12,7 @@
 #endif
 #include <sys/types.h>
 #include "protocol.h"
+#include <malloc.h>
 
 /******************************************************************************
  The following section is for Diku/Merc derivatives.  Replace as needed.