diff --git a/TSRM/tsrm_win32.c b/TSRM/tsrm_win32.c
index 6bf826e6faf..e3d311e418d 100644
--- a/TSRM/tsrm_win32.c
+++ b/TSRM/tsrm_win32.c
@@ -722,10 +722,6 @@ TSRM_API void *shmat(int key, const void *shmaddr, int flags)
 		return (void*)-1;
 	}
 
-	shm->descriptor->shm_atime = time(NULL);
-	shm->descriptor->shm_lpid  = getpid();
-	shm->descriptor->shm_nattch++;
-
 	shm->addr = MapViewOfFileEx(shm->segment, FILE_MAP_ALL_ACCESS, 0, 0, 0, NULL);
 
 	err = GetLastError();
@@ -734,6 +730,10 @@ TSRM_API void *shmat(int key, const void *shmaddr, int flags)
 		return (void*)-1;
 	}
 
+	shm->descriptor->shm_atime = time(NULL);
+	shm->descriptor->shm_lpid  = getpid();
+	shm->descriptor->shm_nattch++;
+
 	return shm->addr;
 }