--- IO-AIO/AIO.xs	2010/12/30 07:19:31	1.177
+++ IO-AIO/AIO.xs	2011/01/07 21:45:42	1.178
@@ -18,7 +18,7 @@
 #include <fcntl.h>
 #include <sched.h>
 
-#if _POSIX_MEMLOCK || _POSIX_MAPPED_FILES
+#if _POSIX_MEMLOCK || _POSIX_MEMLOCK_RANGE || _POSIX_MAPPED_FILES
 # include <sys/mman.h>
 #endif
 
@@ -1526,7 +1526,7 @@
 
         addr = (void *)(((intptr_t)addr) + offset);
         eio_page_align (&addr, &len);
-#if _POSIX_MEMLOCK
+#if _POSIX_MEMLOCK_RANGE
         RETVAL = munlock (addr, len);
 #else
         RETVAL = ((errno = ENOSYS), -1);