diff --git a/config/load.go b/config/load.go
index 76de69a47c..f9be03f497 100644
--- a/config/load.go
+++ b/config/load.go
@@ -35,6 +35,8 @@ func LoadFromReader(configReader io.Reader) (*Config, error) {
 	yyin = configReader
 	yypos = 1
 	yyline = 1
+        yydata = ""
+        yytext = ""
 
 	lexer := &ConfigLexer{}
 	yyParse(lexer)
@@ -54,6 +56,7 @@ func LoadFromString(configString string) (*Config, error) {
 
 func LoadFromFile(fileName string) (*Config, error) {
 	configReader, err := os.Open(fileName)
+        defer configReader.Close()
 	if err != nil {
 		return &Config{}, err
 	}
diff --git a/rules/load.go b/rules/load.go
index eed2822c2b..7c7fe33ebc 100644
--- a/rules/load.go
+++ b/rules/load.go
@@ -48,9 +48,10 @@ func LoadFromReader(rulesReader io.Reader, singleExpr bool) (interface{}, error)
 	yyin = rulesReader
 	yypos = 1
 	yyline = 1
+        yydata = ""
+        yytext = ""
 
 	lexer := &RulesLexer{
-                parsedRules: []*Rule{},
                 startToken: START_RULES,
         }
 
@@ -91,6 +92,7 @@ func LoadRulesFromString(rulesString string) ([]*Rule, error) {
 
 func LoadRulesFromFile(fileName string) ([]*Rule, error) {
 	rulesReader, err := os.Open(fileName)
+        defer rulesReader.Close()
 	if err != nil {
 		return []*Rule{}, err
 	}
@@ -112,6 +114,7 @@ func LoadExprFromString(exprString string) (ast.Node, error) {
 
 func LoadExprFromFile(fileName string) (ast.Node, error) {
 	exprReader, err := os.Open(fileName)
+        defer exprReader.Close()
 	if err != nil {
 		return nil, err
 	}