diff --git a/Modules/rgbimgmodule.c b/Modules/rgbimgmodule.c
index 8c70d95..67b5521 100644
--- a/Modules/rgbimgmodule.c
+++ b/Modules/rgbimgmodule.c
@@ -168,7 +168,7 @@
 	buf[1] = (unsigned char) (val >> 16);
 	buf[2] = (unsigned char) (val >> 8);
 	buf[3] = (unsigned char) (val >> 0);
-	return fwrite(buf, 4, 1, outf);
+	return (int)fwrite(buf, 4, 1, outf);
 }
 
 static void
@@ -200,7 +200,7 @@
 	putlong(outf, image->min);
 	putlong(outf, image->max);
 	putlong(outf, 0);
-	return fwrite("no name", 8, 1, outf);
+	return (int)fwrite("no name", 8, 1, outf);
 }
 
 static int
@@ -567,7 +567,8 @@
 	Py_Int32 *starttab = NULL, *lengthtab = NULL;
 	unsigned char *rlebuf = NULL;
 	unsigned char *lumbuf = NULL;
-	int rlebuflen, goodwrite;
+	int rlebuflen;
+	Py_ssize_t goodwrite;
 	PyObject *retval = NULL;
 
 	if (!PyArg_ParseTuple(args, "s#iiis:longstoimage", &lptr, &len,