diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 4878d83..670f589 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -1215,7 +1215,7 @@
     Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
     if (ival == -1 && PyErr_Occurred()) {
         Py_buffer varg;
-        int pos;
+        Py_ssize_t pos;
         PyErr_Clear();
         if (_getbuffer(arg, &varg) < 0)
             return -1;
@@ -1229,7 +1229,7 @@
         return -1;
     }
 
-    return memchr(PyByteArray_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
+    return memchr(PyByteArray_AS_STRING(self), (int) ival, Py_SIZE(self)) != NULL;
 }
 
 
diff --git a/Objects/bytes_methods.c b/Objects/bytes_methods.c
index 099cee6..ef91b7f 100644
--- a/Objects/bytes_methods.c
+++ b/Objects/bytes_methods.c
@@ -417,7 +417,7 @@
     }
     p = PyBytes_AS_STRING(res);
     for (i = 0; i < 256; i++)
-        p[i] = i;
+        p[i] = (char) i;
     for (i = 0; i < bfrm.len; i++) {
         p[((unsigned char *)bfrm.buf)[i]] = ((char *)bto.buf)[i];
     }
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 0f7e7d3..e580884 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -791,7 +791,7 @@
     Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
     if (ival == -1 && PyErr_Occurred()) {
         Py_buffer varg;
-        int pos;
+        Py_ssize_t pos;
         PyErr_Clear();
         if (_getbuffer(arg, &varg) < 0)
             return -1;
@@ -805,7 +805,7 @@
         return -1;
     }
 
-    return memchr(PyBytes_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
+    return memchr(PyBytes_AS_STRING(self), (int) ival, Py_SIZE(self)) != NULL;
 }
 
 static PyObject *
@@ -1980,7 +1980,7 @@
 }
 
 Py_LOCAL_INLINE(Py_ssize_t)
-countchar(const char *target, int target_len, char c, Py_ssize_t maxcount)
+countchar(const char *target, Py_ssize_t target_len, char c, Py_ssize_t maxcount)
 {
     Py_ssize_t count=0;
     const char *start=target;
@@ -3039,7 +3039,7 @@
             if (_PyBytes_Resize(&new, size) < 0)
                 goto error;
         }
-        ((PyBytesObject *)new)->ob_sval[i] = value;
+        ((PyBytesObject *)new)->ob_sval[i] = (char) value;
     }
     _PyBytes_Resize(&new, i);