diff --git a/examples/cwebp.c b/examples/cwebp.c
index ef84a426..8441e94c 100644
--- a/examples/cwebp.c
+++ b/examples/cwebp.c
@@ -132,7 +132,7 @@ static HRESULT ReadPictureWithWIC(const char* filename,
   IWICBitmapDecoder* pDecoder = NULL;
   IStream* pStream = NULL;
   UINT frameCount = 0;
-  UINT width, height = 0;
+  UINT width = 0, height = 0;
   BYTE* rgb = NULL;
   WICPixelFormatGUID srcPixelFormat = { 0 };
   GUID srcContainerFormat = { 0 };
diff --git a/src/enc/alpha.c b/src/enc/alpha.c
index e012cb6d..2b36733c 100644
--- a/src/enc/alpha.c
+++ b/src/enc/alpha.c
@@ -234,7 +234,7 @@ static int EncodeAlpha(VP8Encoder* const enc,
 
     // Try the other mode(s).
     {
-      WebPAuxStats best_stats;
+      WebPAuxStats best_stats = { 0 };
       size_t best_score = VP8BitWriterSize(&bw);
       if (pic->stats != NULL) best_stats = *pic->stats;
       for (test_filter = WEBP_FILTER_HORIZONTAL;
diff --git a/src/enc/analysis.c b/src/enc/analysis.c
index 9af0325e..22cfb492 100644
--- a/src/enc/analysis.c
+++ b/src/enc/analysis.c
@@ -147,7 +147,7 @@ static void SetSegmentAlphas(VP8Encoder* const enc,
 static void AssignSegments(VP8Encoder* const enc, const int alphas[256]) {
   const int nb = enc->segment_hdr_.num_segments_;
   int centers[NUM_MB_SEGMENTS];
-  int weighted_average;
+  int weighted_average = 0;
   int map[256];
   int a, n, k;
   int min_a = 0, max_a = 255, range_a;