diff --git a/vpxenc.c b/vpxenc.c
index 60ba54759..dfe305205 100644
--- a/vpxenc.c
+++ b/vpxenc.c
@@ -965,8 +965,8 @@ static int parse_stream_params(struct VpxEncoderConfig *global,
               break;
 
           /* Update/insert */
-          assert(j < ARG_CTRL_CNT_MAX);
-          if (j < ARG_CTRL_CNT_MAX) {
+          assert(j < (int)ARG_CTRL_CNT_MAX);
+          if (j < (int)ARG_CTRL_CNT_MAX) {
             config->arg_ctrls[j][0] = ctrl_args_map[i];
             config->arg_ctrls[j][1] = arg_parse_enum_or_int(&arg);
             if (j == config->arg_ctrl_cnt)
@@ -1517,7 +1517,7 @@ int main(int argc, const char **argv_) {
   vpx_image_t raw;
   int frame_avail, got_data;
 
-  struct VpxInputContext input = {0};
+  struct VpxInputContext input;
   struct VpxEncoderConfig global;
   struct stream_state *streams = NULL;
   char **argv, **argi;
@@ -1525,6 +1525,7 @@ int main(int argc, const char **argv_) {
   int stream_cnt = 0;
   int res = 0;
 
+  memset(&input, 0, sizeof(input));
   exec_name = argv_[0];
 
   if (argc < 3)
diff --git a/y4minput.c b/y4minput.c
index b005b71d3..520c33248 100644
--- a/y4minput.c
+++ b/y4minput.c
@@ -683,6 +683,7 @@ static void y4m_convert_444_420jpeg(y4m_input *_y4m, unsigned char *_dst,
 static void y4m_convert_mono_420jpeg(y4m_input *_y4m, unsigned char *_dst,
                                      unsigned char *_aux) {
   int c_sz;
+  (void)_aux;
   _dst += _y4m->pic_w * _y4m->pic_h;
   c_sz = ((_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h) *
          ((_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v);
@@ -692,6 +693,9 @@ static void y4m_convert_mono_420jpeg(y4m_input *_y4m, unsigned char *_dst,
 /*No conversion function needed.*/
 static void y4m_convert_null(y4m_input *_y4m, unsigned char *_dst,
                              unsigned char *_aux) {
+  (void)_y4m;
+  (void)_dst;
+  (void)_aux;
 }
 
 int y4m_input_open(y4m_input *_y4m, FILE *_fin, char *_skip, int _nskip,