diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 8f7fc0c..48a033f 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -903,7 +903,7 @@
 	PyCodeObject *co;
 	PyObject *v;
 	long magic;
-	long PyImport_GetMagicNumber();
+	long PyImport_GetMagicNumber(void);
 
 	magic = PyMarshal_ReadLongFromFile(fp);
 	if (magic != PyImport_GetMagicNumber()) {
@@ -1201,6 +1201,9 @@
 #include <malloc.h>
 #include <excpt.h>
 
+/*
+ * Return non-zero when we run out of memory on the stack; zero otherwise.
+ */
 int
 PyOS_CheckStack()
 {