diff --git a/psutil/_psutil_windows.c b/psutil/_psutil_windows.c
index 201878f134..11176de738 100644
--- a/psutil/_psutil_windows.c
+++ b/psutil/_psutil_windows.c
@@ -1560,7 +1560,7 @@ PsutilMethods[] = {
     {"disk_usage", psutil_disk_usage, METH_VARARGS},
     {"getloadavg", (PyCFunction)psutil_get_loadavg, METH_VARARGS},
     {"getpagesize", psutil_getpagesize, METH_VARARGS},
-    {"getpercentswap", (PyCFunction)psutil_swap_percent, METH_VARARGS},
+    {"swap_percent", psutil_swap_percent, METH_VARARGS},
     {"init_loadavg_counter", (PyCFunction)psutil_init_loadavg_counter, METH_VARARGS},
     {"net_connections", psutil_net_connections, METH_VARARGS},
     {"net_if_addrs", psutil_net_if_addrs, METH_VARARGS},
diff --git a/psutil/_pswindows.py b/psutil/_pswindows.py
index 15c356944f..4081aa17fb 100644
--- a/psutil/_pswindows.py
+++ b/psutil/_pswindows.py
@@ -254,12 +254,12 @@ def swap_memory():
     # pages are accessed, so we can't use free system memory for swap.
     # instead, we calculate page file usage based on performance counter
     if (total > 0):
-        percentswap = cext.getpercentswap()
+        percentswap = cext.swap_percent()
         used = int(0.01 * percentswap * total)
     else:
         used = 0
     free = total - used
-    percent = usage_percent(used, total, round_=1)
+    percent = round(percentswap, 1)
     return _common.sswap(total, used, free, percent, 0, 0)