diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
index 1135139e1..68b5dab82 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
@@ -24,6 +24,7 @@
  */
 
 #include <string>
+#include <climits>
 #include <stdexcept>
 
 #define epicsExportSharedSymbols