diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 6990a76d51e..be757ef6f85 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -1249,7 +1249,7 @@ The handle may be used to locate exported functions in this\n\
 module.\n";
 static PyObject *load_library(PyObject *self, PyObject *args)
 {
-    WCHAR *name;
+    const WCHAR *name;
     PyObject *nameobj;
     PyObject *ignored;
     HMODULE hMod;
diff --git a/PC/_msi.c b/PC/_msi.c
index a901f98a781..9c3f9f6e18a 100644
--- a/PC/_msi.c
+++ b/PC/_msi.c
@@ -594,7 +594,7 @@ summary_setproperty(msiobj* si, PyObject *args)
         return NULL;
 
     if (PyUnicode_Check(data)) {
-        WCHAR *value = _PyUnicode_AsUnicode(data);
+        const WCHAR *value = _PyUnicode_AsUnicode(data);
         if (value == NULL) {
             return NULL;
         }