diff --git a/ext/dba/libcdb/cdb.c b/ext/dba/libcdb/cdb.c
index acafe952f3c..af6e1bb8f0a 100644
--- a/ext/dba/libcdb/cdb.c
+++ b/ext/dba/libcdb/cdb.c
@@ -68,10 +68,11 @@ static int cdb_match(struct cdb *c, char *key, unsigned int len, uint32 pos TSRM
 uint32 cdb_hash(char *buf, unsigned int len)
 {
 	uint32 h;
+	const unsigned char * b = buf;
 
 	h = CDB_HASHSTART;
 	while (len--) {
-		h = ( h + (h << 5)) ^ (*buf++);
+		h = ( h + (h << 5)) ^ (*b++);
 	}
 	return h;
 }
diff --git a/ext/dba/tests/bug38698.phpt b/ext/dba/tests/bug38698.phpt
new file mode 100755
index 00000000000..09f47e3007e
--- /dev/null
+++ b/ext/dba/tests/bug38698.phpt
@@ -0,0 +1,26 @@
+--TEST--
+Bug #38698 (Bug #38698 for some keys cdbmake creates corrupted db and cdb can't read valid db)
+--SKIPIF--
+<?php 
+	$handler = 'cdb_make';
+	require_once('skipif.inc');
+?>
+--FILE--
+<?php
+
+$db_file = '129php.cdb';
+
+if (($db_make=dba_open($db_file, "n", 'cdb_make'))!==FALSE) {
+	dba_insert(pack('i',129), "Booo!", $db_make);
+	dba_close($db_make);
+	// write md5 checksum of generated database file
+	var_dump(md5_file($db_file));
+	@unlink($db_file);
+} else {
+    echo "Error creating database\n";
+}
+?>
+===DONE===
+--EXPECTF--
+string(32) "1f34b74bde3744265acfc21e0f30af95"
+===DONE===