diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index 6257fbd23e6d0703213bcc59b14a487bf52f4707..d3f50f87f352287a1dc1a082f3593697160da5d4 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -167,6 +167,11 @@ int _do_setenv (int flag, int argc, char *argv[])
 
 	name = argv[1];
 
+	if (strchr(name, '=')) {
+		printf ("## Error: illegal character '=' in variable name \"%s\"\n", name);
+		return 1;
+	}
+
 	/*
 	 * search if variable with this name already exists
 	 */