diff --git a/code/AssetLib/Blender/BlenderLoader.cpp b/code/AssetLib/Blender/BlenderLoader.cpp
index 5d3757ca1..c67879be5 100644
--- a/code/AssetLib/Blender/BlenderLoader.cpp
+++ b/code/AssetLib/Blender/BlenderLoader.cpp
@@ -175,7 +175,7 @@ void BlenderImporter::InternReadFile(const std::string &pFile,
 
         size_t total = 0;
         Compression compression;
-        if (compression.open(Compression::Format::Binary, Compression::FlushMode::Finish) ) {
+        if (compression.open(Compression::Format::Binary, Compression::FlushMode::NoFlush, 16 + MAX_WBITS)) {
             total = compression.decompress((unsigned char *)reader->GetPtr(), reader->GetRemainingSize(), uncompressed);
             compression.close();
         }
diff --git a/code/AssetLib/FBX/FBXParser.cpp b/code/AssetLib/FBX/FBXParser.cpp
index 2c0ff95b1..c453647e0 100644
--- a/code/AssetLib/FBX/FBXParser.cpp
+++ b/code/AssetLib/FBX/FBXParser.cpp
@@ -567,7 +567,7 @@ void ReadBinaryDataArray(char type, uint32_t count, const char*& data, const cha
         // zlib/deflate, next comes ZIP head (0x78 0x01)
         // see http://www.ietf.org/rfc/rfc1950.txt
          Compression compress;
-        if (compress.open(Compression::Format::Binary, Compression::FlushMode::Finish)) {
+        if (compress.open(Compression::Format::Binary, Compression::FlushMode::Finish,0)) {
             compress.decompress(data, comp_len, buff);
             compress.close();
         }
diff --git a/code/AssetLib/X/XFileParser.cpp b/code/AssetLib/X/XFileParser.cpp
index 4731710d7..90a257dfa 100644
--- a/code/AssetLib/X/XFileParser.cpp
+++ b/code/AssetLib/X/XFileParser.cpp
@@ -188,7 +188,7 @@ XFileParser::XFileParser(const std::vector<char> &pBuffer) :
         Compression compression;
         uncompressed.resize(est_out + 1);
         char *out = &uncompressed.front();
-        if (compression.open(mIsBinaryFormat ? Compression::Format::Binary : Compression::Format::ASCII, Compression::FlushMode::SyncFlush)) {
+        if (compression.open(mIsBinaryFormat ? Compression::Format::Binary : Compression::Format::ASCII, Compression::FlushMode::SyncFlush, -MAX_WBITS)) {
             while (mP + 3 < mEnd) {
                 uint16_t ofs = *((uint16_t *)mP);
                 AI_SWAP2(ofs);
diff --git a/code/AssetLib/XGL/XGLLoader.cpp b/code/AssetLib/XGL/XGLLoader.cpp
index 966d547ac..4fbee6eea 100644
--- a/code/AssetLib/XGL/XGLLoader.cpp
+++ b/code/AssetLib/XGL/XGLLoader.cpp
@@ -132,7 +132,7 @@ void XGLImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
 
         Compression compression;
         size_t total = 0l;
-        if (compression.open(Compression::Format::Binary, Compression::FlushMode::NoFlush)) {
+        if (compression.open(Compression::Format::Binary, Compression::FlushMode::NoFlush, -MAX_WBITS)) {
             // skip two extra bytes, zgl files do carry a crc16 upfront (I think)
             raw_reader->IncPtr(2);
             total = compression.decompress((unsigned char *)raw_reader->GetPtr(), raw_reader->GetRemainingSize(), uncompressed);
diff --git a/code/Common/Compression.cpp b/code/Common/Compression.cpp
index f6f0db4f4..86f1e9ec0 100644
--- a/code/Common/Compression.cpp
+++ b/code/Common/Compression.cpp
@@ -43,11 +43,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/ai_assert.h>
 #include <assimp/Exceptional.h>
 
-#ifdef ASSIMP_BUILD_NO_OWN_ZLIB
-#include <zlib.h>
-#else
-#include "../contrib/zlib/zlib.h"
-#endif
 
 namespace Assimp {
 
@@ -73,7 +68,7 @@ Compression::~Compression() {
     delete mImpl;
 }
 
-bool Compression::open(Format format, FlushMode flush) {
+bool Compression::open(Format format, FlushMode flush, int windowBits) {
     ai_assert(mImpl != nullptr);
 
     if (mImpl->mOpen) {
@@ -92,7 +87,11 @@ bool Compression::open(Format format, FlushMode flush) {
     }
 
     // raw decompression without a zlib or gzip header
-    inflateInit(&mImpl->mZSstream);
+    if (windowBits == 0) {
+        inflateInit(&mImpl->mZSstream);
+    } else {
+        inflateInit2(&mImpl->mZSstream, windowBits);
+    }
     mImpl->mOpen = true;
 
     return mImpl->mOpen;
diff --git a/code/Common/Compression.h b/code/Common/Compression.h
index aa552ab60..05beed7f7 100644
--- a/code/Common/Compression.h
+++ b/code/Common/Compression.h
@@ -41,6 +41,12 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #pragma once
 
+#ifdef ASSIMP_BUILD_NO_OWN_ZLIB
+#include <zlib.h>
+#else
+#include "../contrib/zlib/zlib.h"
+#endif
+
 #include <vector>
 
 namespace Assimp {
@@ -49,20 +55,20 @@ namespace Assimp {
 class Compression {
 public:
     enum class Format {
+        InvalidFormat = -1,
         Binary = 0,
         ASCII,
 
-        NumFormats,
-        InvalidFormat
+        NumFormats
     };
 
     enum class FlushMode {
+        InvalidFormat = -1,
         NoFlush = 0,
         SyncFlush,
         Finish,
 
-        NumModes,
-        InvalidMode
+        NumModes
     };
 
     /// @brief  The class constructor.
@@ -73,7 +79,7 @@ public:
 
     /// @brief  Will open the access to the compression.
     /// @return true if close was successful, false if not.
-    bool open(Format format, FlushMode flush);
+    bool open(Format format, FlushMode flush, int windowBits);
 
     /// @brief  Will return the open state.
     /// @return true if the access is opened, false if not.