diff --git a/src/libCom/osi/os/default/epicsMMIODef.h b/src/libCom/osi/os/default/epicsMMIODef.h
index 77a57d215..087f880a0 100644
--- a/src/libCom/osi/os/default/epicsMMIODef.h
+++ b/src/libCom/osi/os/default/epicsMMIODef.h
@@ -113,11 +113,8 @@ nat_iowrite32(volatile void* addr, epicsUInt32 val)
 
 #elif EPICS_BYTE_ORDER == EPICS_ENDIAN_LITTLE
 
-#include <arpa/inet.h>
-#ifdef __rtems__
-   /* some rtems bsps (pc386) don't provide htonl correctly */
-#  include <rtems/endian.h>
-#endif
+/* Get hton[sl] declarations: */
+#include <osdSock.h>
 
 /** @ingroup mmio
  *@{