diff --git a/cmd/host/main.go b/cmd/host/main.go
index 856fbbd..112cf81 100644
--- a/cmd/host/main.go
+++ b/cmd/host/main.go
@@ -35,7 +35,7 @@ func main() {
 
 	for _, arg := range flag.Args() {
 		if err := lookupHost(arg); err != nil {
-			log.Println("%s: %s", arg, err)
+			log.Printf("%s: %s", arg, err)
 		}
 	}
 }
diff --git a/cmd/zsearch/main.go b/cmd/zsearch/main.go
index c2c9adc..af6e6aa 100644
--- a/cmd/zsearch/main.go
+++ b/cmd/zsearch/main.go
@@ -68,7 +68,7 @@ func showFile(path string) {
 func searchFile(path string, search *regexp.Regexp) error {
 	file, err := os.Open(path)
 	if err != nil {
-		errorf("%v")
+		errorf("%v", err)
 		return err
 	}
 	defer file.Close()