diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
index 3793a84ae..42a980a27 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
@@ -23,6 +23,7 @@
  *	johill@lanl.gov
  */
 
+#include <string>
 #include <stdexcept>
 
 #define epicsExportSharedSymbols