diff --git a/modules/libcom/src/osi/os/default/epicsMMIODef.h b/modules/libcom/src/osi/os/default/epicsMMIODef.h
index e8e869422..7de7b65de 100644
--- a/modules/libcom/src/osi/os/default/epicsMMIODef.h
+++ b/modules/libcom/src/osi/os/default/epicsMMIODef.h
@@ -130,7 +130,7 @@ bswap32(epicsUInt32 value)
 #elif EPICS_BYTE_ORDER == EPICS_ENDIAN_LITTLE
 
 /* Get hton[sl] declarations: */
-#include <osdSock.h>
+#include <osiSock.h>
 
 /** @ingroup mmio
  *@{