diff --git a/src/libCom/osi/os/posix/epicsTempFile.cpp b/src/libCom/osi/os/posix/epicsTempFile.cpp
index baa80fdd4..5c4c197a2 100644
--- a/src/libCom/osi/os/posix/epicsTempFile.cpp
+++ b/src/libCom/osi/os/posix/epicsTempFile.cpp
@@ -8,6 +8,8 @@
 * in file LICENSE that is included with this distribution. 
 \*************************************************************************/
 
+#include <string.h>
+
 #include "epicsStdio.h"
 
 extern "C"