diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index da90559..d7a4fe1 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -1705,7 +1705,7 @@
 	TkttObject *v = (TkttObject *)self;
 	char buf[100];
 
-	sprintf(buf, "<tktimertoken at 0x%lx%s>", (long)v,
+	sprintf(buf, "<tktimertoken at %p%s>", v,
 		v->func == NULL ? ", handler deleted" : "");
 	return PyString_FromString(buf);
 }
diff --git a/Modules/flmodule.c b/Modules/flmodule.c
index c6ce439..900f381 100644
--- a/Modules/flmodule.c
+++ b/Modules/flmodule.c
@@ -435,8 +435,8 @@
 	genericobject *g;
 {
 	char buf[100];
-	sprintf(buf, "<FORMS_object at %lx, objclass=%d>",
-		(long)g, g->ob_generic->objclass);
+	sprintf(buf, "<FORMS_object at %p, objclass=%d>",
+		g, g->ob_generic->objclass);
 	return PyString_FromString(buf);
 }
 
@@ -1906,8 +1906,8 @@
 	formobject *f;
 {
 	char buf[100];
-	sprintf(buf, "<FORMS_form at %lx, window=%ld>",
-		(long)f, f->ob_form->window);
+	sprintf(buf, "<FORMS_form at %p, window=%ld>",
+		f, f->ob_form->window);
 	return PyString_FromString(buf);
 }
 
diff --git a/Modules/mpzmodule.c b/Modules/mpzmodule.c
index af44abf..09d46b9 100644
--- a/Modules/mpzmodule.c
+++ b/Modules/mpzmodule.c
@@ -262,7 +262,7 @@
 
 #ifdef MPZ_DEBUG
 	fprintf(stderr,
-		"mpz_format: cp (str end) 0x%x, begin 0x%x, diff %d, i %d\n",
+		"mpz_format: cp (str end) %p, begin %p, diff %d, i %d\n",
 		cp, PyString_AS_STRING(strobjp),
 		cp - PyString_AS_STRING(strobjp), i);
 #endif /* def MPZ_DEBUG */	
@@ -1765,7 +1765,7 @@
 		Py_FatalError("mp_allocate failure");
 
 #ifdef MPZ_DEBUG
-	fprintf(stderr, "mp_allocate  :     address 0x%08x\n", res);
+	fprintf(stderr, "mp_allocate  :     address %08p\n", res);
 #endif /* def MPZ_DEBUG */	
 
 	MP_SET_TEST(res,alloc_size);
@@ -1782,7 +1782,7 @@
 	void *res;
 
 #ifdef MPZ_DEBUG
-	fprintf(stderr, "mp_reallocate: old address 0x%08x, old size %ld\n",
+	fprintf(stderr, "mp_reallocate: old address %08p, old size %ld\n",
 		ptr, old_size);
 #endif /* def MPZ_DEBUG */	
 
@@ -1792,7 +1792,7 @@
 		Py_FatalError("mp_reallocate failure");
 
 #ifdef MPZ_DEBUG
-	fprintf(stderr, "mp_reallocate: new address 0x%08x, new size %ld\n",
+	fprintf(stderr, "mp_reallocate: new address %08p, new size %ld\n",
 		res, new_size);
 #endif /* def MPZ_DEBUG */	
 
@@ -1808,7 +1808,7 @@
 {
 
 #ifdef MPZ_DEBUG
-	fprintf(stderr, "mp_free      : old address 0x%08x, old size %ld\n",
+	fprintf(stderr, "mp_free      : old address %08p, old size %ld\n",
 		ptr, size);
 #endif /* def MPZ_DEBUG */