diff --git a/msi.c b/msi.c
index 6cee34fbe..278746682 100644
--- a/msi.c
+++ b/msi.c
@@ -26,6 +26,10 @@
 
 #define MAX_BUFFER_SIZE 4096
 
+#if ((EPICS_VERSION <= 3) && (EPICS_REVISION <= 13))
+#define macEnvExpand(x) strdup(x)
+#endif
+
 /*Forward references to local routines*/
 static void usageExit(void);
 static void addMacroReplacements(MAC_HANDLE *macPvt,char *pval);
diff --git a/msi.html b/msi.html
index 82c168791..86ec39018 100644
--- a/msi.html
+++ b/msi.html
@@ -161,8 +161,9 @@ it specified it is used, otherwise the file template is used. This format is
 an extension of the format accepted by dbLoadTemplate. It allows templates to
 be&nbsp; expanded on the host rather via dbLoadTemplate. The file name may
 appear inside double quotation marks; these are only required if the name
-contains any environment variable macros of the form ${MOTOR} which will be
-expanded before the file is opened. 
+contains any environment variable macros of the form ${ENV_VAR} which will be
+expanded before the file is opened. Environment variable macro expansion
+is available when msi is linked with EPICS base R3.14.3 or newer.
 
 <h3>Regular substitution example</h3>
 Let the command be: