diff --git a/libsass b/libsass
index 62314f6a..b87f4c7a 160000
--- a/libsass
+++ b/libsass
@@ -1 +1 @@
-Subproject commit 62314f6a3cbc7dbed3878884504847edd7fecb7b
+Subproject commit b87f4c7a14fd03852bda7238c305269d3340447e
diff --git a/pysass.cpp b/pysass.cpp
index d58b579b..1bfed69a 100644
--- a/pysass.cpp
+++ b/pysass.cpp
@@ -362,10 +362,12 @@ static union Sass_Value* _to_sass_value(PyObject* value) {
 }
 
 static union Sass_Value* _call_py_f(
-        const union Sass_Value* sass_args, void* cookie
+        const union Sass_Value* sass_args,
+        Sass_Function_Entry cb,
+        struct Sass_Options* opts
 ) {
     size_t i;
-    PyObject* pyfunc = (PyObject*)cookie;
+    PyObject* pyfunc = (PyObject*)sass_function_get_cookie(cb);
     PyObject* py_args = PyTuple_New(sass_list_get_length(sass_args));
     PyObject* py_result = NULL;
     union Sass_Value* sass_result = NULL;
@@ -394,13 +396,13 @@ static void _add_custom_functions(
         struct Sass_Options* options, PyObject* custom_functions
 ) {
     Py_ssize_t i;
-    Sass_C_Function_List fn_list = sass_make_function_list(
+    Sass_Function_List fn_list = sass_make_function_list(
         PyList_Size(custom_functions)
     );
     for (i = 0; i < PyList_GET_SIZE(custom_functions); i += 1) {
         PyObject* sass_function = PyList_GET_ITEM(custom_functions, i);
         PyObject* signature = PySass_Object_Bytes(sass_function);
-        Sass_C_Function_Callback fn = sass_make_function(
+        Sass_Function_Entry fn = sass_make_function(
             PySass_Bytes_AS_STRING(signature),
             _call_py_f,
             sass_function
diff --git a/sasstests.py b/sasstests.py
index aed141bc..15991952 100644
--- a/sasstests.py
+++ b/sasstests.py
@@ -1009,34 +1009,40 @@ def test_raises(self):
                 r'       Backtrace:\n'
                 r'       \tstdin:0, in function `raises`\n'
                 r'       \tstdin:0\n'
-                r'        on line 1 of stdin\n$'
+                r'        on line 1 of stdin\n'
+                r'>> a { content: raises\(\); }\n'
+                r'   -------------\^\n$'
         )):
             compile_with_func('a { content: raises(); }')
 
     def test_warning(self):
         with assert_raises_compile_error(
-                'Error: warning in C function returns-warning: '
+                'Error: warning in C function returns_warning: '
                 'This is a warning\n'
                 '       Backtrace:\n'
-                '       \tstdin:0, in function `returns-warning`\n'
+                '       \tstdin:0, in function `returns_warning`\n'
                 '       \tstdin:0\n'
                 '        on line 1 of stdin\n'
+                '>> a { content: returns_warning(); }\n'
+                '   -------------^\n'
         ):
             compile_with_func('a { content: returns_warning(); }')
 
     def test_error(self):
         with assert_raises_compile_error(
-                'Error: error in C function returns-error: This is an error\n'
+                'Error: error in C function returns_error: This is an error\n'
                 '       Backtrace:\n'
-                '       \tstdin:0, in function `returns-error`\n'
+                '       \tstdin:0, in function `returns_error`\n'
                 '       \tstdin:0\n'
                 '        on line 1 of stdin\n'
+                '>> a { content: returns_error(); }\n'
+                '   -------------^\n'
         ):
             compile_with_func('a { content: returns_error(); }')
 
     def test_returns_unknown_object(self):
         with assert_raises_compile_error(
-                'Error: error in C function returns-unknown: '
+                'Error: error in C function returns_unknown: '
                 'Unexpected type: `tuple`.\n'
                 '       Expected one of:\n'
                 '       - None\n'
@@ -1050,9 +1056,11 @@ def test_returns_unknown_object(self):
                 '       - SassWarning\n'
                 '       - SassError\n\n'
                 '       Backtrace:\n'
-                '       \tstdin:0, in function `returns-unknown`\n'
+                '       \tstdin:0, in function `returns_unknown`\n'
                 '       \tstdin:0\n'
                 '        on line 1 of stdin\n'
+                '>> a { content: returns_unknown(); }\n'
+                '   -------------^\n'
         ):
             compile_with_func('a { content: returns_unknown(); }')