diff --git a/papaparse.js b/papaparse.js
index 5f670bd..1c3f466 100755
--- a/papaparse.js
+++ b/papaparse.js
@@ -1113,6 +1113,10 @@
 						header = header.trim();
 					}
 
+					if (_config.lowercaseHeaders) {
+						header = header.toLowerCase();
+					}
+
 					_fields.push(header);
 				}
 			_results.data.splice(0, 1);
diff --git a/tests/test-cases.js b/tests/test-cases.js
index ad0d9a5..0400123 100644
--- a/tests/test-cases.js
+++ b/tests/test-cases.js
@@ -733,6 +733,15 @@ var PARSE_TESTS = [
 			errors: []
 		}
 	},
+	{
+		description: "Header rows are lowercase when lowercaseHeader is set",
+		input: 'A,b\r\na,b',
+		config: { header: true, lowercaseHeaders: true },
+		expected: {
+			data: [{"a": "a", "b": "b"}],
+			errors: []
+		}
+	},
 	{
 		description: "Line ends with quoted field, first field of next line is empty using headers",
 		input: 'a,b,"c"\r\nd,e,"f"\r\n,"h","i"\r\n,"k","l"',