diff --git a/src/GZipDecodingStreamFilter.cc b/src/GZipDecodingStreamFilter.cc
index d24acc3e..07b8a0af 100644
--- a/src/GZipDecodingStreamFilter.cc
+++ b/src/GZipDecodingStreamFilter.cc
@@ -48,6 +48,7 @@ GZipDecodingStreamFilter::GZipDecodingStreamFilter(
     : StreamFilter{std::move(delegate)},
       strm_{nullptr},
       finished_{false},
+      rawMode_{false},
       bytesProcessed_{0}
 {
 }
@@ -66,7 +67,8 @@ void GZipDecodingStreamFilter::init()
   strm_->next_in = Z_NULL;
 
   // initialize z_stream with gzip/zlib format auto detection enabled.
-  if (Z_OK != inflateInit2(strm_, 47)) {
+  // negative windowBits enables raw mode support.
+  if (Z_OK != inflateInit2(strm_, rawMode_ ? -15 : 47)) {
     throw DL_ABORT_EX("Initializing z_stream failed.");
   }
 }
@@ -105,6 +107,12 @@ GZipDecodingStreamFilter::transform(const std::shared_ptr<BinaryStream>& out,
       finished_ = true;
     }
     else if (ret != Z_OK && ret != Z_BUF_ERROR) {
+      if (!rawMode_) {
+        // reset in raw mode
+        rawMode_ = true;
+        init();
+        return transform(out, segment, inbuf, inlen);
+      }
       throw DL_ABORT_EX(fmt("libz::inflate() failed. cause:%s", strm_->msg));
     }
 
diff --git a/src/GZipDecodingStreamFilter.h b/src/GZipDecodingStreamFilter.h
index d9c3c22e..c24f5789 100644
--- a/src/GZipDecodingStreamFilter.h
+++ b/src/GZipDecodingStreamFilter.h
@@ -49,6 +49,8 @@ private:
 
   bool finished_;
 
+  bool rawMode_;
+
   size_t bytesProcessed_;
 
   static const size_t OUTBUF_LENGTH = 16_k;