diff --git a/include/maxminddb.h b/include/maxminddb.h
index 27080669..1455be91 100644
--- a/include/maxminddb.h
+++ b/include/maxminddb.h
@@ -17,8 +17,6 @@ extern "C" {
 #include <ws2tcpip.h>
 /* libmaxminddb package version from configure */
 
-typedef ADDRESS_FAMILY sa_family_t;
-
 #if defined(_MSC_VER)
 /* MSVC doesn't define signed size_t, copy it from configure */
 #define ssize_t SSIZE_T
diff --git a/src/maxminddb.c b/src/maxminddb.c
index 0596568a..4349824e 100644
--- a/src/maxminddb.c
+++ b/src/maxminddb.c
@@ -23,6 +23,7 @@
 #endif
 #include <windows.h>
 #include <ws2ipdef.h>
+typedef ADDRESS_FAMILY sa_family_t;
 #else
 #include <arpa/inet.h>
 #include <sys/mman.h>