diff --git a/src/vars.c b/src/vars.c
index 59c29aa..e37ff74 100644
--- a/src/vars.c
+++ b/src/vars.c
@@ -211,7 +211,7 @@
 	/* Check variable name syntax. */
 	tmp = var_names[var_names_nb - 1];
 	while (*tmp) {
-		if (!isalnum((int)(unsigned char)*tmp) && *tmp != '_') {
+		if (!isalnum((int)(unsigned char)*tmp) && *tmp != '_' && *tmp != '.') {
 			memprintf(err, "invalid syntax at char '%s'", tmp);
 			return NULL;
 		}