diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
index 1e4908fd9f0..297611cec46 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -446,7 +446,7 @@ unicodedata_decomposition(PyObject *self, PyObject *args)
     return PyString_FromString(decomp);
 }
 
-void
+static void
 get_decomp_record(PyObject *self, Py_UCS4 code, int *index, int *prefix, int *count)
 {
     if (code >= 0x110000) {