diff --git a/ext/imap/tests/imap_mutf7_to_utf8.phpt b/ext/imap/tests/imap_mutf7_to_utf8.phpt
index 3d4d7a405785..4ff2e15cc574 100644
--- a/ext/imap/tests/imap_mutf7_to_utf8.phpt
+++ b/ext/imap/tests/imap_mutf7_to_utf8.phpt
@@ -2,6 +2,14 @@
 imap_mutf7_to_utf8
 --EXTENSIONS--
 imap
+--SKIPIF--
+<?php
+// The underlying imap_mutf7_to_utf8 function can be missing; there's a
+// ./configure check for it that disables the corresponding PHP function.
+if (!function_exists('imap_mutf7_to_utf8')) {
+    die("skip no imap_mutf7_to_utf8 function");
+}
+?>
 --FILE--
 <?php
 
diff --git a/ext/imap/tests/imap_utf8_to_mutf7_basic.phpt b/ext/imap/tests/imap_utf8_to_mutf7_basic.phpt
index 97a9b4730344..146c330c502e 100644
--- a/ext/imap/tests/imap_utf8_to_mutf7_basic.phpt
+++ b/ext/imap/tests/imap_utf8_to_mutf7_basic.phpt
@@ -2,6 +2,14 @@
 imap_utf8_to_mutf7
 --EXTENSIONS--
 imap
+--SKIPIF--
+<?php
+// The underlying imap_utf8_to_mutf7 function can be missing; there's a
+// ./configure check for it that disables the corresponding PHP function.
+if (!function_exists('imap_utf8_to_mutf7')) {
+    die("skip no imap_utf8_to_mutf7 function");
+}
+?>
 --FILE--
 <?php