1 files changed, 1 insertions, 1 deletions
diff --git a/thread.h b/thread.h
index 2c6e192a7f..f1f4d8eeef 100644
--- a/thread.h
+++ b/thread.h
@@ -225,7 +225,7 @@ typedef struct condpair {
 #define THR
 /* Rats: if dTHR is just blank then the subsequent ";" throws an error */
 #ifdef WIN32
-#define dTHR
+#define dTHR extern int Perl___notused
 #else
 #define dTHR extern int errno
 #endif