diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
index 2308ca0ff..06c60459f 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
@@ -25,6 +25,7 @@
 #include <string>
 #include <climits>
 #include <stdexcept>
+#include <stdio.h>
 
 #define epicsExportSharedSymbols
 #include "ipAddrToAsciiAsynchronous.h"
diff --git a/src/libCom/timer/timer.cpp b/src/libCom/timer/timer.cpp
index de38f103d..a17b434f6 100644
--- a/src/libCom/timer/timer.cpp
+++ b/src/libCom/timer/timer.cpp
@@ -19,6 +19,7 @@
 #include <typeinfo>
 #include <string>
 #include <stdexcept>
+#include <stdio.h>
 
 #define epicsExportSharedSymbols
 #include "epicsGuard.h"