diff --git a/ext/phar/phar_object.c b/ext/phar/phar_object.c
index 9982074f73a81..4b294c13fb274 100644
--- a/ext/phar/phar_object.c
+++ b/ext/phar/phar_object.c
@@ -2266,7 +2266,7 @@ static zend_object *phar_convert_to_other(phar_archive_data *source, int convert
 		zend_throw_exception_ex(phar_ce_PharException, 0, "unable to create temporary file");
 		return NULL;
 	}
-	phar->fname = source->fname;
+	phar->fname = estrndup(source->fname, source->fname_len);
 	phar->fname_len = source->fname_len;
 	phar->is_temporary_alias = source->is_temporary_alias;
 	phar->alias = source->alias;
diff --git a/ext/phar/tests/gh19752.phpt b/ext/phar/tests/gh19752.phpt
new file mode 100644
index 0000000000000..c6ffab5b06860
--- /dev/null
+++ b/ext/phar/tests/gh19752.phpt
@@ -0,0 +1,16 @@
+--TEST--
+GH-19752 (missing dup in phar_convert_to_other)
+--EXTENSIONS--
+phar
+--FILE--
+<?php
+$phar = new PharData('test.1');
+
+try {
+    $phar->decompress("*");
+} catch (Exception $ex) {
+    var_dump($ex->getMessage());
+}
+?>
+--EXPECTF--
+string(%d) "data phar converted from "%stest.1" has invalid extension *"