diff --git a/src/common/core/thread.d b/src/common/core/thread.d
index 2c6c4a2bf7..d7095f97f4 100644
--- a/src/common/core/thread.d
+++ b/src/common/core/thread.d
@@ -99,14 +99,14 @@ version( Windows )
             //       these are defined in dm\src\win32\tlsseg.asm by DMC.
             extern (C)
             {
-                extern __thread size_t _tlsstart;
-                extern __thread size_t _tlsend;
+                extern __thread int _tlsstart;
+                extern __thread int _tlsend;
             }
         }
         else
         {
-            size_t _tlsstart;
-            alias  _tlsstart _tlsend;
+            int   _tlsstart;
+            alias _tlsstart _tlsend;
         }
 
 
@@ -189,14 +189,14 @@ else version( Posix )
         {
             extern (C)
             {
-                extern __thread size_t _tlsstart;
-                extern __thread size_t _tlsend;
+                extern __thread int _tlsstart;
+                extern __thread int _tlsend;
             }
         }
         else
         {
-            size_t _tlsstart;
-            alias  _tlsstart _tlsend;
+            int   _tlsstart;
+            alias _tlsstart _tlsend;
         }