diff --git a/jmespath.js b/jmespath.js
index 0a36691..0c05162 100644
--- a/jmespath.js
+++ b/jmespath.js
@@ -1322,7 +1322,7 @@
     },
 
     _functionStartsWith: function(resolvedArgs) {
-        return resolvedArgs[0].lastIndexOf(resolvedArgs[1]) === 0;
+        return resolvedArgs[0].indexOf(resolvedArgs[1]) === 0;
     },
 
     _functionEndsWith: function(resolvedArgs) {
diff --git a/test/compliance/functions.json b/test/compliance/functions.json
index 8b8db36..2853adc 100644
--- a/test/compliance/functions.json
+++ b/test/compliance/functions.json
@@ -431,6 +431,10 @@
       "expression": "starts_with(str, 'String')",
       "result": false
     },
+    {
+      "expression": "starts_with('StringString', 'S')",
+      "result": true
+    },
     {
       "expression": "starts_with(str, `0`)",
       "error": "invalid-type"