diff --git a/plugins/check_mysql.c b/plugins/check_mysql.c
index a9f0f600..d82dea14 100644
--- a/plugins/check_mysql.c
+++ b/plugins/check_mysql.c
@@ -362,7 +362,7 @@ validate_arguments (void)
 		db_host = strdup("");
 
 	if (db_pass == NULL)
-		db_pass == strdup("");
+		db_pass = strdup("");
 
 	if (db == NULL)
 		db = strdup("");
diff --git a/plugins/check_mysql_query.c b/plugins/check_mysql_query.c
index 6c5e4367..e887bca2 100644
--- a/plugins/check_mysql_query.c
+++ b/plugins/check_mysql_query.c
@@ -271,7 +271,7 @@ validate_arguments (void)
 		db_host = strdup("");
 
 	if (db_pass == NULL)
-		db_pass == strdup("");
+		db_pass = strdup("");
 
 	if (db == NULL)
 		db = strdup("");