diff --git a/src/font.cc b/src/font.cc
index a45153e..0e9f5bf 100644
--- a/src/font.cc
+++ b/src/font.cc
@@ -66,7 +66,7 @@ bool ReadTrueTypeFont(Buffer* file, const uint8_t* data, size_t len,
 
   std::map<uint32_t, uint32_t> intervals;
   for (uint16_t i = 0; i < font->num_tables; ++i) {
-    Font::Table table;
+    Font::Table table = {};
     table.flag_byte = 0;
     table.reuse_of = NULL;
     if (!file->ReadU32(&table.tag) ||
@@ -326,7 +326,7 @@ int NumGlyphs(const Font& font) {
     return 0;
   }
   int index_fmt = IndexFormat(font);
-  int loca_record_size = (index_fmt == 0 ? 2 : 4);
+  uint32_t loca_record_size = (index_fmt == 0 ? 2 : 4);
   if (loca_table->length < loca_record_size) {
     return 0;
   }
diff --git a/src/glyph.h b/src/glyph.h
index f24056f..e870188 100644
--- a/src/glyph.h
+++ b/src/glyph.h
@@ -22,17 +22,17 @@ namespace woff2 {
 // is around.
 class Glyph {
  public:
-  Glyph() : instructions_size(0), composite_data_size(0) {}
+  Glyph() {}
 
   // Bounding box.
-  int16_t x_min;
-  int16_t x_max;
-  int16_t y_min;
-  int16_t y_max;
+  int16_t x_min = 0;
+  int16_t x_max = 0;
+  int16_t y_min = 0;
+  int16_t y_max = 0;
 
   // Instructions.
-  uint16_t instructions_size;
-  const uint8_t* instructions_data;
+  uint16_t instructions_size = 0;
+  const uint8_t* instructions_data = 0;
 
   // Data model for simple glyphs.
   struct Point {
@@ -43,9 +43,9 @@ class Glyph {
   std::vector<std::vector<Point> > contours;
 
   // Data for composite glyphs.
-  const uint8_t* composite_data;
-  uint32_t composite_data_size;
-  bool have_instructions;
+  const uint8_t* composite_data = 0;
+  uint32_t composite_data_size = 0;
+  bool have_instructions = false;
 };
 
 // Parses the glyph from the given data. Returns false on parsing failure or
diff --git a/src/normalize.cc b/src/normalize.cc
index 6685e08..a819074 100644
--- a/src/normalize.cc
+++ b/src/normalize.cc
@@ -97,7 +97,7 @@ bool MakeEditableBuffer(Font* font, int tableTag) {
   table->buffer.resize(sz);
   uint8_t* buf = &table->buffer[0];
   memcpy(buf, table->data, table->length);
-  if (PREDICT_FALSE(sz > table->length)) {
+  if (PREDICT_FALSE(static_cast<uint32_t>(sz) > table->length)) {
     memset(buf + table->length, 0, sz - table->length);
   }
   table->data = buf;
@@ -213,7 +213,6 @@ bool FixChecksums(Font* font) {
   size_t offset = 8;
   StoreU32(0, &offset, head_buf);
   uint32_t file_checksum = 0;
-  uint32_t head_checksum = 0;
   for (auto& i : font->tables) {
     Font::Table* table = &i.second;
     if (table->IsReused()) {
@@ -221,10 +220,6 @@ bool FixChecksums(Font* font) {
     }
     table->checksum = ComputeULongSum(table->data, table->length);
     file_checksum += table->checksum;
-
-    if (table->tag == kHeadTableTag) {
-      head_checksum = table->checksum;
-    }
   }
 
   file_checksum += ComputeHeaderChecksum(*font);
diff --git a/src/woff2_dec.cc b/src/woff2_dec.cc
index 25e18c6..442baa5 100644
--- a/src/woff2_dec.cc
+++ b/src/woff2_dec.cc
@@ -316,7 +316,7 @@ void ComputeBbox(unsigned int n_points, const Point* points, uint8_t* dst) {
   offset = Store16(dst, offset, x_min);
   offset = Store16(dst, offset, y_min);
   offset = Store16(dst, offset, x_max);
-  offset = Store16(dst, offset, y_max);
+  Store16(dst, offset, y_max);
 }
 
 
diff --git a/src/woff2_enc.cc b/src/woff2_enc.cc
index ec00878..c0598f8 100644
--- a/src/woff2_enc.cc
+++ b/src/woff2_enc.cc
@@ -331,20 +331,17 @@ bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
         return false;
       }
 
-      Table table;
+      Table table = {};
       table.tag = src_table.tag;
       table.flags = src_table.flag_byte;
       table.src_length = src_table.length;
       table.transform_length = src_table.length;
-      const uint8_t* transformed_data = src_table.data;
       const Font::Table* transformed_table =
           font.FindTable(src_table.tag ^ 0x80808080);
       if (transformed_table != NULL) {
         table.flags = transformed_table->flag_byte;
         table.flags |= kWoff2FlagsTransform;
         table.transform_length = transformed_table->length;
-        transformed_data = transformed_table->data;
-
       }
       tables.push_back(table);
     }
@@ -423,8 +420,6 @@ bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
         // for reused tables, only the original has an updated offset
         uint32_t table_offset =
           table.IsReused() ? table.reuse_of->offset : table.offset;
-        uint32_t table_length =
-          table.IsReused() ? table.reuse_of->length : table.length;
         std::pair<uint32_t, uint32_t> tag_offset(table.tag, table_offset);
         if (index_by_tag_offset.find(tag_offset) == index_by_tag_offset.end()) {
 #ifdef FONT_COMPRESSION_BIN
diff --git a/src/woff2_info.cc b/src/woff2_info.cc
index 2b51adc..8ec9d36 100644
--- a/src/woff2_info.cc
+++ b/src/woff2_info.cc
@@ -122,13 +122,13 @@ int main(int argc, char **argv) {
     if (!woff2::Read255UShort(&file, &numFonts)) return 1;
     printf("CollectionHeader 0x%08x %d fonts\n", version, numFonts);
 
-    for (auto i = 0; i < numFonts; i++) {
+    for (auto i = 0u; i < numFonts; i++) {
       uint32_t numTables, flavor;
       if (!woff2::Read255UShort(&file, &numTables)) return 1;
       if (!file.ReadU32(&flavor)) return 1;
       printf("CollectionFontEntry %d flavor 0x%08x %d tables\n", i, flavor,
           numTables);
-      for (auto j = 0; j < numTables; j++) {
+      for (auto j = 0u; j < numTables; j++) {
         uint32_t table_idx;
         if (!woff2::Read255UShort(&file, &table_idx)) return 1;
         if (table_idx >= table_tags.size()) return 1;