diff --git a/Python/importdl.c b/Python/importdl.c
index f56fa94..d8656b9 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -94,7 +94,7 @@
 #endif
     PyObject *name_unicode = NULL, *name = NULL, *path = NULL, *m = NULL;
     const char *name_buf, *hook_prefix;
-    char *oldcontext;
+    const char *oldcontext;
     dl_funcptr exportfunc;
     PyModuleDef *def;
     PyObject *(*p0)(void);
diff --git a/Python/modsupport.c b/Python/modsupport.c
index 35b529b..06bdcab 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -9,7 +9,7 @@
 static PyObject *va_build_value(const char *, va_list, int);
 
 /* Package context -- the full module name for package imports */
-char *_Py_PackageContext = NULL;
+const char *_Py_PackageContext = NULL;
 
 /* Helper for mkvalue() to scan the length of a format */