diff --git a/src/if_py_both.h b/src/if_py_both.h
index 8229458..0912ee0 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -495,7 +495,7 @@
     if (!PyArg_ParseTuple(args, "s", &expr))
 	return NULL;
 
-    return PyLong_FromLong(mb_string2cells((char_u *)expr, STRLEN(expr)));
+    return PyLong_FromLong(mb_string2cells((char_u *)expr, (int)STRLEN(expr)));
 }
 
 /*
diff --git a/src/version.c b/src/version.c
index 074ce3e..29943e3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    580,
+/**/
     579,
 /**/
     578,