diff --git a/lib/isc/random.c b/lib/isc/random.c
index 9cf635a37f..3f49cb512f 100644
--- a/lib/isc/random.c
+++ b/lib/isc/random.c
@@ -67,6 +67,8 @@
 static thread_local isc_once_t isc_random_once = ISC_ONCE_INIT;
 #elif defined(HAVE___THREAD)
 static __thread isc_once_t isc_random_once = ISC_ONCE_INIT;
+#elif defined(HAVE___DECLSPEC_THREAD)
+static __declspec( thread ) isc_once_t isc_random_once = ISC_ONCE_INIT;
 #else
 #error "Unknown method for defining a TLS variable!"
 #endif
diff --git a/lib/isc/win32/include/isc/platform.h.in b/lib/isc/win32/include/isc/platform.h.in
index 7f2bdbfb6b..691ac00122 100644
--- a/lib/isc/win32/include/isc/platform.h.in
+++ b/lib/isc/win32/include/isc/platform.h.in
@@ -16,6 +16,11 @@
  ***** Platform-dependent defines.
  *****/
 
+#if _MSC_VER > 1400
+#define HAVE_TLS 1
+#define HAVE___DECLSPEC_THREAD 1
+#endif
+
 /*
  * Some compatibility cludges
  */
diff --git a/lib/isc/xoshiro128starstar.c b/lib/isc/xoshiro128starstar.c
index bc08e6740f..fb71a24419 100644
--- a/lib/isc/xoshiro128starstar.c
+++ b/lib/isc/xoshiro128starstar.c
@@ -42,6 +42,8 @@
 static thread_local uint32_t seed[4];
 #elif defined(HAVE___THREAD)
 static __thread uint32_t seed[4];
+#elif defined(HAVE___DECLSPEC_THREAD)
+static __declspec( thread ) uint32_t seed[4];
 #else
 #error "Unknown method for defining a TLS variable!"
 #endif