diff --git a/src/cfg.c b/src/cfg.c
index b4428eb2..2bbc2fc0 100644
--- a/src/cfg.c
+++ b/src/cfg.c
@@ -661,7 +661,7 @@ int kvz_config_parse(kvz_config *cfg, const char *name, const char *value)
         unsigned d;  // depth
         unsigned r;  // references 
         unsigned t;  // temporal
-      } gop = { 0 };
+      } gop = { 0, 0, 0, 0 };
 
       if (sscanf(value, "lp-g%ud%ur%ut%u", &gop.g, &gop.d, &gop.r, &gop.t) != 4) {
         fprintf(stderr, "Error in GOP syntax. Example: lp-g8d4r2t2\n");
diff --git a/src/inter.c b/src/inter.c
index 1ac15059..8e5544d0 100644
--- a/src/inter.c
+++ b/src/inter.c
@@ -45,7 +45,7 @@ static void inter_recon_frac_luma(const encoder_state_t * const state,
  #define FILTER_SIZE_Y 8 //Luma filter size
 
   // Fractional luma 1/4-pel
-  kvz_extended_block src = {0, 0, 0};
+  kvz_extended_block src = {0, 0, 0, 0};
 
   // Fractional luma
   kvz_get_extended_block(xpos,
@@ -90,7 +90,7 @@ static void inter_recon_14bit_frac_luma(const encoder_state_t * const state,
 #define FILTER_SIZE_Y 8 //Luma filter size
 
   // Fractional luma 1/4-pel
-  kvz_extended_block src = { 0, 0, 0 };
+  kvz_extended_block src = { 0, 0, 0, 0 };
 
   // Fractional luma
   kvz_get_extended_block(xpos,
@@ -141,8 +141,8 @@ static void inter_recon_frac_chroma(const encoder_state_t * const state,
 #define FILTER_SIZE_C 4 //Chroma filter size
 
   // Fractional chroma 1/8-pel
-  kvz_extended_block src_u = { 0, 0, 0 };
-  kvz_extended_block src_v = { 0, 0, 0 };
+  kvz_extended_block src_u = { 0, 0, 0, 0 };
+  kvz_extended_block src_v = { 0, 0, 0, 0 };
 
   //Fractional chroma U
   kvz_get_extended_block(xpos, ypos, (mv_param[0] >> 2) >> 1, (mv_param[1] >> 2) >> 1, state->tile->lcu_offset_x * LCU_WIDTH_C, state->tile->lcu_offset_y * LCU_WIDTH_C,
@@ -181,8 +181,8 @@ static void inter_recon_14bit_frac_chroma(const encoder_state_t * const state,
 #define FILTER_SIZE_C 4 //Chroma filter size
 
   // Fractional chroma 1/8-pel
-  kvz_extended_block src_u = { 0, 0, 0 };
-  kvz_extended_block src_v = { 0, 0, 0 };
+  kvz_extended_block src_u = { 0, 0, 0, 0 };
+  kvz_extended_block src_v = { 0, 0, 0, 0 };
 
   //Fractional chroma U
   kvz_get_extended_block(xpos,
diff --git a/src/kvazaar.c b/src/kvazaar.c
index 3bed4d2a..89132d76 100644
--- a/src/kvazaar.c
+++ b/src/kvazaar.c
@@ -283,7 +283,7 @@ static int kvazaar_field_encoding_adapter(kvz_encoder *enc,
   struct {
     kvz_data_chunk* data_out;
     uint32_t len_out;
-  } first = { 0 }, second = { 0 };
+  } first = { 0, 0 }, second = { 0, 0 };
 
   if (pic_in != NULL) {
     first_field = kvz_image_alloc(state->encoder_control->in.width, state->encoder_control->in.height);
diff --git a/src/search_inter.c b/src/search_inter.c
index 34c4202f..350c9db9 100644
--- a/src/search_inter.c
+++ b/src/search_inter.c
@@ -1017,7 +1017,7 @@ static unsigned search_frac(encoder_state_t * const state,
 
   unsigned costs[4] = { 0 };
 
-  kvz_extended_block src = { 0, 0, 0 };
+  kvz_extended_block src = { 0, 0, 0, 0 };
 
   // Buffers for interpolated fractional pixels one 
   // for each position excluding the integer position.