diff --git a/lib/isc/win32/include/isc/platform.h.in b/lib/isc/win32/include/isc/platform.h.in
index b927888f1c..6369fc5630 100644
--- a/lib/isc/win32/include/isc/platform.h.in
+++ b/lib/isc/win32/include/isc/platform.h.in
@@ -36,7 +36,9 @@
 #endif
 
 #include <stdint.h>
+#if _MSC_VER < 1914
 typedef uint32_t socklen_t;
+#endif
 
 #endif