diff --git a/Makefile b/Makefile
index cbb27b2..c59283a 100644
--- a/Makefile
+++ b/Makefile
@@ -4,12 +4,23 @@ SSE2   := yes
 TARGET ?= $(shell uname -s 2>/dev/null || echo unknown)
 override TARGET := $(shell echo $(TARGET) | tr A-Z a-z)
 
-JAVA_HOME ?= $(realpath $(dir $(realpath $(shell which java)))../)
+JAVA_HOME ?= $(realpath $(dir $(realpath $(shell which javac)))../)
 
 ifeq ($(TARGET), darwin)
 	DYLIB     := dylib
 	LDFLAGS	  := -dynamiclib -Wl,-undefined -Wl,dynamic_lookup -Wl,-single_module
 	CFLAGS    += -I $(JAVA_HOME)/Headers/
+else ifeq ($(TARGET), win32)
+	DYLIB     := dll
+	LDFLAGS   := -shared
+	CC        := i586-mingw32msvc-cc
+	SSE2      :=
+	CFLAGS    += -I $(JAVA_HOME)/include -I $(JAVA_HOME)/include/$(TARGET) -DNO_HAVE_POSIX_MEMALIGN
+else ifeq ($(TARGET), win64)
+	DYLIB     := dll
+	LDFLAGS   := -shared
+	CC        := x86_64-w64-mingw32-gcc
+	CFLAGS    += -I $(JAVA_HOME)/include -I $(JAVA_HOME)/include/$(TARGET) -DNO_HAVE_POSIX_MEMALIGN
 else
 	DYLIB     := so
 	LDFLAGS   := -shared
diff --git a/README b/README
index 873c303..565c338 100644
--- a/README
+++ b/README
@@ -82,3 +82,10 @@ Building Native Implementation
   A precompiled native library for Android 2.3 running on ARM is located in
   src/android/resources/lib/arm5/libscrypt.so. If placed in an .apk file's
   lib/armeabi directory it will be automatically loaded.
+
+  To build the Windows shared library, you need MinGW. On Ubuntu, this is:
+    * mingw32
+    * mingw32-binutils
+    * mingw32-runtime
+    * mingw-w64
+    * mingw-w64-tools
diff --git a/src/main/c/crypto_scrypt-nosse.c b/src/main/c/crypto_scrypt-nosse.c
index 5f6690b..edf83d8 100644
--- a/src/main/c/crypto_scrypt-nosse.c
+++ b/src/main/c/crypto_scrypt-nosse.c
@@ -29,7 +29,10 @@
 #include "scrypt_platform.h"
 
 #include <sys/types.h>
+
+#ifdef HAVE_POSIX_MEMALIGN
 #include <sys/mman.h>
+#endif
 
 #include <errno.h>
 #include <stdint.h>
diff --git a/src/main/c/crypto_scrypt-sse.c b/src/main/c/crypto_scrypt-sse.c
index 3da4903..348002d 100644
--- a/src/main/c/crypto_scrypt-sse.c
+++ b/src/main/c/crypto_scrypt-sse.c
@@ -29,7 +29,9 @@
 #include "scrypt_platform.h"
 
 #include <sys/types.h>
+#ifdef HAVE_POSIX_MEMALIGN
 #include <sys/mman.h>
+#endif
 
 #include <emmintrin.h>
 #include <errno.h>
diff --git a/src/main/include/config.h b/src/main/include/config.h
index 1f0dc1e..ba7d8d5 100644
--- a/src/main/include/config.h
+++ b/src/main/include/config.h
@@ -2,8 +2,10 @@
 #define HAVE_MMAP 1
 
 #ifndef __ANDROID__
+#ifndef NO_HAVE_POSIX_MEMALIGN
 #define HAVE_POSIX_MEMALIGN 1
 #endif
+#endif
 
 #ifdef __ANDROID__
 #include <sys/limits.h>
diff --git a/src/main/java/com/lambdaworks/jni/JarLibraryLoader.java b/src/main/java/com/lambdaworks/jni/JarLibraryLoader.java
index fd9d3ab..892b656 100644
--- a/src/main/java/com/lambdaworks/jni/JarLibraryLoader.java
+++ b/src/main/java/com/lambdaworks/jni/JarLibraryLoader.java
@@ -134,6 +134,9 @@ private List<String> libCandidates(Platform platform, String name) {
                 candidates.add(sb + ".dylib");
                 candidates.add(sb + ".jnilib");
                 break;
+            case windows:
+                candidates.add(sb + ".dll");
+                break;
             case linux:
             case freebsd:
                 candidates.add(sb + ".so");
diff --git a/src/main/java/com/lambdaworks/jni/Platform.java b/src/main/java/com/lambdaworks/jni/Platform.java
index 953d593..e9df619 100644
--- a/src/main/java/com/lambdaworks/jni/Platform.java
+++ b/src/main/java/com/lambdaworks/jni/Platform.java
@@ -27,6 +27,7 @@ public enum Arch {
     }
 
     public enum OS {
+        windows ("windows .*"),
         darwin ("darwin|mac os x"),
         freebsd("freebsd"),
         linux  ("linux");
diff --git a/src/main/resources/lib/x86/windows/libscrypt.dll b/src/main/resources/lib/x86/windows/libscrypt.dll
new file mode 100755
index 0000000..cf1ac6b
Binary files /dev/null and b/src/main/resources/lib/x86/windows/libscrypt.dll differ
diff --git a/src/main/resources/lib/x86_64/windows/libscrypt.dll b/src/main/resources/lib/x86_64/windows/libscrypt.dll
new file mode 100755
index 0000000..a4dc08f
Binary files /dev/null and b/src/main/resources/lib/x86_64/windows/libscrypt.dll differ