diff --git a/Include/descrobject.h b/Include/descrobject.h
index 8f3e84c..013d645 100644
--- a/Include/descrobject.h
+++ b/Include/descrobject.h
@@ -9,10 +9,10 @@
 typedef int (*setter)(PyObject *, PyObject *, void *);
 
 typedef struct PyGetSetDef {
-    char *name;
+    const char *name;
     getter get;
     setter set;
-    char *doc;
+    const char *doc;
     void *closure;
 } PyGetSetDef;
 
@@ -24,11 +24,11 @@
                                       void *wrapped, PyObject *kwds);
 
 struct wrapperbase {
-    char *name;
+    const char *name;
     int offset;
     void *function;
     wrapperfunc wrapper;
-    char *doc;
+    const char *doc;
     int flags;
     PyObject *name_strobj;
 };
diff --git a/Include/structmember.h b/Include/structmember.h
index 5da8a46..b54f708 100644
--- a/Include/structmember.h
+++ b/Include/structmember.h
@@ -16,11 +16,11 @@
    pointer is NULL. */
 
 typedef struct PyMemberDef {
-    char *name;
+    const char *name;
     int type;
     Py_ssize_t offset;
     int flags;
-    char *doc;
+    const char *doc;
 } PyMemberDef;
 
 /* Types */
diff --git a/Include/structseq.h b/Include/structseq.h
index af22716..e5e5d5c 100644
--- a/Include/structseq.h
+++ b/Include/structseq.h
@@ -8,13 +8,13 @@
 #endif
 
 typedef struct PyStructSequence_Field {
-    char *name;
-    char *doc;
+    const char *name;
+    const char *doc;
 } PyStructSequence_Field;
 
 typedef struct PyStructSequence_Desc {
-    char *name;
-    char *doc;
+    const char *name;
+    const char *doc;
     struct PyStructSequence_Field *fields;
     int n_in_sequence;
 } PyStructSequence_Desc;