diff --git a/Makefile.win b/Makefile.win
index 17e5a17..280caaa 100644
--- a/Makefile.win
+++ b/Makefile.win
@@ -1,19 +1,22 @@
 CXX = cl.exe
-CFLAGS = /nologo /O2 /EHsc /D "_CRT_SECURE_NO_DEPRECATE" /D "USEOMP" /openmp
+CFLAGS = /nologo /O2 /EHsc /D "_CRT_SECURE_NO_DEPRECATE" /D "USEOMP" /D "USESSE" /openmp
 
 TARGET = windows
 
 all: $(TARGET) $(TARGET)\ffm-train.exe $(TARGET)\ffm-predict.exe
 
-$(TARGET)\ffm-predict.exe: ffm.h ffm-predict.cpp ffm.obj
-	$(CXX) $(CFLAGS) ffm-predict.cpp ffm.obj -Fe$(TARGET)\ffm-predict.exe
+$(TARGET)\ffm-predict.exe: ffm.h ffm-predict.cpp ffm.obj timer.obj
+	$(CXX) $(CFLAGS) ffm-predict.cpp ffm.obj timer.obj -Fe$(TARGET)\ffm-predict.exe
 
-$(TARGET)\ffm-train.exe: ffm.h ffm-train.cpp ffm.obj
-	$(CXX) $(CFLAGS) ffm-train.cpp ffm.obj -Fe$(TARGET)\ffm-train.exe
+$(TARGET)\ffm-train.exe: ffm.h ffm-train.cpp ffm.obj timer.obj
+	$(CXX) $(CFLAGS) ffm-train.cpp ffm.obj timer.obj -Fe$(TARGET)\ffm-train.exe
 
 ffm.obj: ffm.cpp ffm.h
 	$(CXX) $(CFLAGS) -c ffm.cpp
 
+timer.obj: timer.cpp timer.h
+	$(CXX) $(CFLAGS) -c timer.cpp
+
 .PHONY: $(TARGET)
 $(TARGET):
 	-mkdir $(TARGET)
diff --git a/README b/README
index b6a3a6d..c447aa4 100644
--- a/README
+++ b/README
@@ -249,7 +249,7 @@ Building Windows Binaries
 
 The Windows part is maintained by different maintainer, so it may not always support the latest version.
 
-The latest version it supports is: v1.14
+The latest version it supports is: v1.21
 
 To build them via command-line tools of Visual C++, use the following steps:
 
diff --git a/ffm.cpp b/ffm.cpp
index 2f13845..c111aed 100644
--- a/ffm.cpp
+++ b/ffm.cpp
@@ -363,7 +363,7 @@ uint64_t hashfile(string txt_path, bool one_block=false)
 
     ffm_long end = (ffm_long) f.tellg();
     f.seekg(0, ios::beg);
-    assert(f.tellg() == 0);
+    assert(static_cast<int>(f.tellg()) == 0);
 
     uint64_t magic = 90359;
     for(ffm_long pos = 0; pos < end; ) {
@@ -499,10 +499,14 @@ bool check_same_txt_bin(string txt_path, string bin_path) {
 
 ffm_model::~ffm_model() {
     if(W != nullptr) {
-#ifdef _WIN32
-        _aligned_free(W);
+#ifndef USESSE
+        free(W);
 #else
+    #ifdef _WIN32
+        _aligned_free(W);
+    #else
         free(W);
+    #endif
 #endif
         W = nullptr;
     }