diff --git a/src/libCom/osi/epicsMutex.h b/src/libCom/osi/epicsMutex.h
index 268a0df6e..f5b44671d 100644
--- a/src/libCom/osi/epicsMutex.h
+++ b/src/libCom/osi/epicsMutex.h
@@ -21,6 +21,7 @@ typedef enum {
 
 #ifdef __cplusplus
 
+#include <new>
 #include <stdexcept>
 
 class epicsMutex {