diff --git a/src/conf.c b/src/conf.c
index 9660ed0..19e6b5a 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -385,6 +385,10 @@ static int set_string_arg (char **var, const char *line, regmatch_t * match)
         if (!arg)
                 return -1;
 
+        if (*var != NULL) {
+                safefree (*var);
+        }
+
         *var = arg;
 
         return 0;