1 files changed, 1 insertions, 1 deletions

diff --git a/shell/msh.c b/shell/msh.c
index 2fb0df739..14e875854 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -4290,7 +4290,7 @@ int quoted;
                         }
 
                         var_name[var_index++] = *src++;
-                        while (isalnum(*src))
+                        while (isalnum(*src) || *src=='_')
                                 var_name[var_index++] = *src++;
                         var_name[var_index] = 0;