1 files changed, 4 insertions, 0 deletions
diff --git a/thread.h b/thread.h
index 2328f7ed82..726a59d003 100644
--- a/thread.h
+++ b/thread.h
@@ -183,5 +183,9 @@ typedef struct condpair {
 
 #define THR
 /* Rats: if dTHR is just blank then the subsequent ";" throws an error */
+#ifdef WIN32
+#define dTHR
+#else
 #define dTHR extern int errno
+#endif
 #endif /* USE_THREADS */