diff --git a/include/ziparchive/zip_archive.h b/include/ziparchive/zip_archive.h
index 7dc60ae..4f68c3b 100644
--- a/include/ziparchive/zip_archive.h
+++ b/include/ziparchive/zip_archive.h
@@ -43,8 +43,7 @@
   /*
    * entry_name has to be an c-style string with only ASCII characters.
    */
-  explicit ZipString(const char* entry_name)
-      : name(reinterpret_cast<const uint8_t*>(entry_name)), name_length(strlen(entry_name)) {}
+  explicit ZipString(const char* entry_name);
 
   bool operator==(const ZipString& rhs) const {
     return name && (name_length == rhs.name_length) &&
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index 350be31..4649a75 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -31,6 +31,7 @@
 #include <vector>
 
 #include "android-base/file.h"
+#include "android-base/logging.h"
 #include "android-base/macros.h"  // TEMP_FAILURE_RETRY may or may not be in unistd
 #include "android-base/memory.h"
 #include "log/log.h"
@@ -1073,3 +1074,10 @@
 int GetFileDescriptor(const ZipArchiveHandle handle) {
   return reinterpret_cast<ZipArchive*>(handle)->fd;
 }
+
+ZipString::ZipString(const char* entry_name)
+    : name(reinterpret_cast<const uint8_t*>(entry_name)) {
+  size_t len = strlen(entry_name);
+  CHECK_LE(len, static_cast<size_t>(UINT16_MAX));
+  name_length = static_cast<uint16_t>(len);
+}
diff --git a/libziparchive/zip_writer.cc b/libziparchive/zip_writer.cc
index 1ebed30..b72ed7f 100644
--- a/libziparchive/zip_writer.cc
+++ b/libziparchive/zip_writer.cc
@@ -243,8 +243,12 @@
   // Initialize the z_stream for compression.
   z_stream_ = std::unique_ptr<z_stream, void(*)(z_stream*)>(new z_stream(), DeleteZStream);
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wold-style-cast"
   int zerr = deflateInit2(z_stream_.get(), Z_BEST_COMPRESSION, Z_DEFLATED, -MAX_WBITS,
                           DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+#pragma GCC diagnostic pop
+
   if (zerr != Z_OK) {
     if (zerr == Z_VERSION_ERROR) {
       ALOGE("Installed zlib is not compatible with linked version (%s)", ZLIB_VERSION);