diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc4fba6..3a51281 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,10 +20,13 @@ if(MSVC)
         set (ADDITIONAL_FLAGS "")
     elseif (TARGET_ARCH STREQUAL "sse2")
         set (ADDITIONAL_FLAGS "/arch:SSE2")
+        add_definitions(-D__SSE2__)
     elseif (TARGET_ARCH STREQUAL "avx")
         set (ADDITIONAL_FLAGS "/arch:AVX")
+        add_definitions(-D__SSE2__)
     elseif (TARGET_ARCH STREQUAL "avx2")
         set (ADDITIONAL_FLAGS "/arch:AVX2")
+        add_definitions(-D__SSE2__)
     endif()
 
     set ( CMAKE_C_FLAGS_DEBUG "-DDEBUG -DC_FLAGS -Zc:__cplusplus -Zi -Od ${ADDITIONAL_FLAGS}" )
diff --git a/requirements.txt b/requirements.txt
index 152d9da..7e6c5fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-numpy>=1.10.0
\ No newline at end of file
+numpy>=1.10.0,<2
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 3844654..a3ff6c1 100644
--- a/setup.py
+++ b/setup.py
@@ -19,8 +19,6 @@ def get_extra_cmake_options():
     """read --clean, --no, --set, --compiler-flags, and -G options from the command line and add them as cmake switches.
     """
     _cmake_extra_options = ["-DCMAKE_POSITION_INDEPENDENT_CODE=1"]
-    if os.environ.get('KIWI_CPU_ARCH'):
-        _cmake_extra_options.append("-DKIWI_CPU_ARCH=" + os.environ['KIWI_CPU_ARCH'])
     if os.environ.get('MACOSX_DEPLOYMENT_TARGET'):
         _cmake_extra_options.append("-DCMAKE_OSX_DEPLOYMENT_TARGET=" + os.environ['MACOSX_DEPLOYMENT_TARGET'])
     _clean_build_folder = False
@@ -212,7 +210,12 @@ def build_extension(self, ext):
 
 # if target is in 64bit, remove 'none'
 if struct.calcsize("P") == 8:
-    arch_levels.remove('none')
+    try:
+        arch_levels.remove('none')
+    except ValueError:
+        pass
+else:
+    arch_levels = [a for a in arch_levels if a in ('none', 'sse2')]
 
 modules = []
 if len(arch_levels) > 1:
diff --git a/src/TopicModel/TopicModel.hpp b/src/TopicModel/TopicModel.hpp
index d1a9068..54a4253 100644
--- a/src/TopicModel/TopicModel.hpp
+++ b/src/TopicModel/TopicModel.hpp
@@ -107,7 +107,7 @@ namespace tomoto
 
 		virtual operator RawDoc() const
 		{
-			RawDoc raw{ *this };
+			RawDoc raw{ *static_cast<const RawDocKernel*>(this) };
 			if (wOrder.empty())
 			{
 				raw.words.insert(raw.words.begin(), words.begin(), words.end());