diff --git a/src/libCom/iocsh/iocsh.cpp b/src/libCom/iocsh/iocsh.cpp
index a3cbd22a1..46f8d3529 100644
--- a/src/libCom/iocsh/iocsh.cpp
+++ b/src/libCom/iocsh/iocsh.cpp
@@ -567,6 +567,12 @@ iocshBody (const char *pathname, const char *commandLine)
         if ((prompt == NULL) && *line && (commandLine == NULL))
             puts(line);
 
+        /*
+         * Ignore lines that become comment lines after macro expansion
+         */
+        if (*line == '#')
+            continue;
+
         /*
          * Break line into words
          */