diff --git a/ffm-predict.cpp b/ffm-predict.cpp
index 5fdecad..fd34903 100644
--- a/ffm-predict.cpp
+++ b/ffm-predict.cpp
@@ -86,6 +86,8 @@ void predict(string test_path, string model_path, string output_path) {
     loss /= i;
 
     cout << "logloss = " << fixed << setprecision(5) << loss << endl;
+
+    fclose(f_in);
 }
 
 int main(int argc, char **argv) {