diff --git a/winsup/cygwin/release/3.1.7 b/winsup/cygwin/release/3.1.7
new file mode 100644
index 000000000..6ce316fc4
--- /dev/null
+++ b/winsup/cygwin/release/3.1.7
@@ -0,0 +1,4 @@
+Bug Fixes:
+----------
+
+- Fix acl_get_* functions in 32-bit Cygwin (pointer sign extension)
diff --git a/winsup/cygwin/sec_posixacl.h b/winsup/cygwin/sec_posixacl.h
index a3790a52b..0f9e7bde3 100644
--- a/winsup/cygwin/sec_posixacl.h
+++ b/winsup/cygwin/sec_posixacl.h
@@ -34,7 +34,7 @@ struct __acl_t
 inline acl_entry_t
 __to_entry (acl_t acl, uint16_t idx)
 {
-  return ((uint64_t) idx << 48) | (uint64_t) acl;
+  return ((uint64_t) idx << 48) | (uint64_t) ((uintptr_t) acl);
 }
 #define __to_permset(a,i)	((acl_permset_t)__to_entry((a),(i)))