diff --git a/ext/standard/string.c b/ext/standard/string.c
index c8d11c1abdb..047f5454d63 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -2847,6 +2847,7 @@ static void php_strtr_array(zval *return_value, zend_string *input, HashTable *p
 				len = ZSTR_LEN(key_used);
 				if (UNEXPECTED(len > slen)) {
 					/* skip long patterns */
+					zend_string_release(key_used);
 					continue;
 				}
 				if (len > maxlen) {
diff --git a/ext/standard/tests/strings/bug78612.phpt b/ext/standard/tests/strings/bug78612.phpt
new file mode 100644
index 00000000000..7dad605e80d
--- /dev/null
+++ b/ext/standard/tests/strings/bug78612.phpt
@@ -0,0 +1,18 @@
+--TEST--
+Bug #78612 (strtr leaks memory when integer keys are used and the subject string shorter).
+--FILE--
+<?php
+
+$find_replace = array();
+$_a = 7111222333000001;
+$_b = 5000001;
+
+for ($j=0; $j<10; $j++) {
+	$find_replace[$_a + $j] = $_b + $j;
+}
+
+echo strtr('Hello', $find_replace), "\n";
+
+?>
+--EXPECT--
+Hello