diff --git a/dnn/lpcnet.c b/dnn/lpcnet.c
index d9c928fb..ee289084 100644
--- a/dnn/lpcnet.c
+++ b/dnn/lpcnet.c
@@ -204,15 +204,25 @@ int main(int argc, char **argv) {
         return 0;
     }
     fin = fopen(argv[1], "rb");
+    if (fin == NULL) {
+	fprintf(stderr, "Can't open %s\n", argv[1]);
+	exit(1);
+    }
+
     fout = fopen(argv[2], "wb");
+    if (fout == NULL) {
+	fprintf(stderr, "Can't open %s\n", argv[2]);
+	exit(1);
+    }
+
     while (1) {
         float in_features[NB_TOTAL_FEATURES];
         float features[NB_FEATURES];
         short pcm[FRAME_SIZE];
         fread(in_features, sizeof(features[0]), NB_TOTAL_FEATURES, fin);
+        if (feof(fin)) break;
         RNN_COPY(features, in_features, NB_FEATURES);
         RNN_CLEAR(&features[18], 18);
-        if (feof(fin)) break;
         lpcnet_synthesize(net, pcm, features, FRAME_SIZE);
         fwrite(pcm, sizeof(pcm[0]), FRAME_SIZE, fout);
     }