diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc4fba6..2e04595 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,7 @@ 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")
     elseif (TARGET_ARCH STREQUAL "avx2")
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..cccd77e 100644
--- a/setup.py
+++ b/setup.py
@@ -212,7 +212,10 @@ 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
 
 modules = []
 if len(arch_levels) > 1: