diff --git a/compat.h b/compat.h
index 59e378e..3573e3b 100644
--- a/compat.h
+++ b/compat.h
@@ -15,3 +15,11 @@ void *reallocarray(void *, size_t, size_t);
 #ifndef HAVE_TIMINGSAFE_MEMCMP
 int timingsafe_memcmp(const void *, const void *, size_t);
 #endif
+
+#ifndef HAVE_STRSEP
+char *strsep(char **sp, char *sep);
+#endif
+
+#ifndef HAVE_STPCPY
+char* stpcpy(char *dst, const char *src);
+#endif
diff --git a/compat/freezero.c b/compat/freezero.c
index 31face3..e94975f 100644
--- a/compat/freezero.c
+++ b/compat/freezero.c
@@ -19,6 +19,7 @@
 
 #include <string.h>
 #include <stdlib.h>
+#include "compat.h"
 
 void
 freezero(void *ptr, size_t sz)
diff --git a/compat/stpcpy.c b/compat/stpcpy.c
new file mode 100644
index 0000000..0608694
--- /dev/null
+++ b/compat/stpcpy.c
@@ -0,0 +1,8 @@
+#ifndef HAVE_STPCPY
+#include <string.h>
+char* stpcpy(char *dst, const char *src)
+{
+	const size_t len = strlen(src);
+	return (char*)memcpy(dst, src, len + 1) + len;
+}
+#endif
diff --git a/compat/strsep.c b/compat/strsep.c
new file mode 100644
index 0000000..5a6b980
--- /dev/null
+++ b/compat/strsep.c
@@ -0,0 +1,35 @@
+#ifndef HAVE_STRSEP
+#include <string.h>
+char *strsep(char **s, const char *delim)
+{
+	char *begin, *end;
+	begin = *s;
+	if (!begin) {
+		return 0;
+	}
+	if (delim[0] == '\0' || delim[1] == '\0') {
+		char ch = delim[0];
+		if (ch == '\0') {
+			end = 0;
+		} else {
+			if (*begin == ch) {
+				end = begin;
+			} else if (*begin == '\0') {
+				end = 0;
+			} else {
+				end = strchr(begin + 1, ch);
+			}
+		}
+	} else {
+		end = strpbrk(begin, delim);
+	}
+	if (end) {
+		*end++ = '\0';
+		*s = end;
+	}
+	else {
+		*s = 0;
+	}
+	return begin;
+}
+#endif
diff --git a/tls.c b/tls.c
index 1d1a8f3..8ea97ff 100644
--- a/tls.c
+++ b/tls.c
@@ -15,7 +15,11 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <sys/socket.h>
+#ifdef WIN32
+# include <Winsock2.h>
+#else
+# include <sys/socket.h>
+#endif
 
 #include <errno.h>
 #include <limits.h>
diff --git a/tls_client.c b/tls_client.c
index 27500fb..908c3d3 100644
--- a/tls_client.c
+++ b/tls_client.c
@@ -16,16 +16,20 @@
  */
 
 #include <sys/types.h>
-#include <sys/socket.h>
+#ifdef WIN32
+# include <Winsock2.h>
+# include <ws2tcpip.h>
+#else
+# include <sys/socket.h>
+# include <arpa/inet.h>
+# include <netinet/in.h>
+# include <netdb.h>
+#endif
 #include <sys/stat.h>
 
-#include <arpa/inet.h>
-#include <netinet/in.h>
-
 #include <assert.h>
 #include <errno.h>
 #include <limits.h>
-#include <netdb.h>
 #include <stdlib.h>
 #include <unistd.h>
 
diff --git a/tls_conninfo.c b/tls_conninfo.c
index e0ce051..6994c9b 100644
--- a/tls_conninfo.c
+++ b/tls_conninfo.c
@@ -22,6 +22,10 @@
 #include <tls.h>
 #include "tls_internal.h"
 
+#ifdef WIN32
+# include <time.h>
+#endif
+
 int ASN1_time_tm_clamp_notafter(struct tm *tm);
 
 int
diff --git a/tls_internal.h b/tls_internal.h
index b2a6a25..777a715 100644
--- a/tls_internal.h
+++ b/tls_internal.h
@@ -21,8 +21,13 @@
 
 #include <pthread.h>
 
-#include <arpa/inet.h>
-#include <netinet/in.h>
+#ifdef WIN32
+# include <Winsock2.h>
+# include <in6addr.h>
+#else
+# include <netinet/in.h>
+# include <arpa/inet.h>
+#endif
 
 #include <bearssl.h>
 
diff --git a/tls_server.c b/tls_server.c
index 71c0483..f00e5d9 100644
--- a/tls_server.c
+++ b/tls_server.c
@@ -15,9 +15,13 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <sys/socket.h>
-
-#include <arpa/inet.h>
+#ifdef WIN32
+# include <Winsock2.h>
+# include <ws2tcpip.h>
+#else
+# include <sys/socket.h>
+# include <arpa/inet.h>
+#endif
 
 #include <errno.h>
 #include <stdlib.h>