diff --git a/src/libCom/Makefile b/src/libCom/Makefile
index 207085cb3..511f3fdf4 100644
--- a/src/libCom/Makefile
+++ b/src/libCom/Makefile
@@ -181,6 +181,7 @@ INC += osiUnistd.h
 INC += osiWireFormat.h
 INC += osdWireFormat.h
 INC += osdWireConfig.h
+INC += epicsEndian.h
 INC += epicsReadline.h
 INC += epicsMessageQueue.h
 INC += epicsStdio.h