diff --git a/src/core/httphandler/notebook.go b/src/core/httphandler/notebook.go
index 5c958ce..5a487ce 100644
--- a/src/core/httphandler/notebook.go
+++ b/src/core/httphandler/notebook.go
@@ -58,6 +58,7 @@ func GetFileContent(abspath string) (string, error) {
 	if err != nil {
 		return "", pkgErrors.Wrapf(err, "Could not open notebook main file %s; ", abspath)
 	}
+	defer f.Close()
 
 	content, err := ioutil.ReadAll(f)
 	if err != nil {