diff --git a/TSRM/tsrm_win32.c b/TSRM/tsrm_win32.c
index 285ab61e48a..42a72946466 100644
--- a/TSRM/tsrm_win32.c
+++ b/TSRM/tsrm_win32.c
@@ -437,6 +437,7 @@ static shm_pair *shm_get(int key, void *addr)
 	TWG(shm) = newptr;
 	ptr = newptr + TWG(shm_size);
 	TWG(shm_size)++;
+	memset(ptr, 0, sizeof(*ptr));
 	return ptr;
 }