diff --git a/fish_tests.cpp b/fish_tests.cpp
index 0c273643a..af65b70ab 100644
--- a/fish_tests.cpp
+++ b/fish_tests.cpp
@@ -585,63 +585,63 @@ static void test_parser()
     parser_t parser(PARSER_TYPE_GENERAL, true);
 
     say(L"Testing block nesting");
-    if (!parser.detect_errors(L"if; end"))
+    if (!parse_util_detect_errors(L"if; end"))
     {
         err(L"Incomplete if statement undetected");
     }
-    if (!parser.detect_errors(L"if test; echo"))
+    if (!parse_util_detect_errors(L"if test; echo"))
     {
         err(L"Missing end undetected");
     }
-    if (!parser.detect_errors(L"if test; end; end"))
+    if (!parse_util_detect_errors(L"if test; end; end"))
     {
         err(L"Unbalanced end undetected");
     }
 
     say(L"Testing detection of invalid use of builtin commands");
-    if (!parser.detect_errors(L"case foo"))
+    if (!parse_util_detect_errors(L"case foo"))
     {
         err(L"'case' command outside of block context undetected");
     }
-    if (!parser.detect_errors(L"switch ggg; if true; case foo;end;end"))
+    if (!parse_util_detect_errors(L"switch ggg; if true; case foo;end;end"))
     {
         err(L"'case' command outside of switch block context undetected");
     }
-    if (!parser.detect_errors(L"else"))
+    if (!parse_util_detect_errors(L"else"))
     {
         err(L"'else' command outside of conditional block context undetected");
     }
-    if (!parser.detect_errors(L"else if"))
+    if (!parse_util_detect_errors(L"else if"))
     {
         err(L"'else if' command outside of conditional block context undetected");
     }
-    if (!parser.detect_errors(L"if false; else if; end"))
+    if (!parse_util_detect_errors(L"if false; else if; end"))
     {
         err(L"'else if' missing command undetected");
     }
 
-    if (!parser.detect_errors(L"break"))
+    if (!parse_util_detect_errors(L"break"))
     {
         err(L"'break' command outside of loop block context undetected");
     }
     
-    if (parser.detect_errors(L"break --help"))
+    if (parse_util_detect_errors(L"break --help"))
     {
         err(L"'break --help' incorrectly marked as error");
     }
     
-    if (! parser.detect_errors(L"while false ; function foo ; break ; end ; end "))
+    if (! parse_util_detect_errors(L"while false ; function foo ; break ; end ; end "))
     {
         err(L"'break' command inside function allowed to break from loop outside it");
     }
 
     
-    if (!parser.detect_errors(L"exec ls|less") || !parser.detect_errors(L"echo|return"))
+    if (!parse_util_detect_errors(L"exec ls|less") || !parse_util_detect_errors(L"echo|return"))
     {
         err(L"Invalid pipe command undetected");
     }
     
-    if (parser.detect_errors(L"for i in foo ; switch $i ; case blah ; break; end; end "))
+    if (parse_util_detect_errors(L"for i in foo ; switch $i ; case blah ; break; end; end "))
     {
         err(L"'break' command inside switch falsely reported as error");
     }
diff --git a/parse_util.h b/parse_util.h
index 28e263ed9..862e5a621 100644
--- a/parse_util.h
+++ b/parse_util.h
@@ -163,6 +163,6 @@ wcstring parse_util_escape_string_with_quote(const wcstring &cmd, wchar_t quote)
 /** Given a string, parse it as fish code and then return the indents. The return value has the same size as the string */
 std::vector<int> parse_util_compute_indents(const wcstring &src);
 
-parser_test_error_bits_t parse_util_detect_errors(const wcstring &buff_src, parse_error_list_t *out_errors);
+parser_test_error_bits_t parse_util_detect_errors(const wcstring &buff_src, parse_error_list_t *out_errors = NULL);
 
 #endif