diff --git a/Mac/Modules/hfsplusmodule.c b/Mac/Modules/hfsplusmodule.c
index 56c9cca59b8..425bdb8f8c9 100644
--- a/Mac/Modules/hfsplusmodule.c
+++ b/Mac/Modules/hfsplusmodule.c
@@ -1251,9 +1251,9 @@ PyObject *macos_error_for_call(OSErr err, const char *name, const char *item)
 	char buffer[1024];
 	
 	if (item)
-		sprintf(buffer, "mac error calling %s on %s", name, item);
+		PyOS_snprintf(buffer, sizeof(buffer), "mac error calling %s on %s", name, item);
 	else
-		sprintf(buffer, "mac error calling %s", name);
+		PyOS_snprintf(buffer, sizeof(buffer), "mac error calling %s", name);
 
 	v = Py_BuildValue("(is)", err, buffer);
 	if (v != NULL) {
@@ -1376,9 +1376,9 @@ void printableUniStr(const HFSUniStr255 *uni, char *buffer)
 		UniChar		uch = uni->unicode[i];
 
 		if ((uch & 0x7f) == uch) {
-			sprintf(localbuf, "%c", uch);
+			PyOS_snprintf(localbuf, sizeof(localbuf), "%c", uch);
 		} else {
-			sprintf(localbuf, "\\u%04x", uch);
+			PyOS_snprintf(localbuf, sizeof(localbuf), "\\u%04x", uch);
 		}
 		strcat(buffer, localbuf);
 	}
diff --git a/Mac/Modules/macfsmodule.c b/Mac/Modules/macfsmodule.c
index 9b635e36e4a..26d7d7f750d 100644
--- a/Mac/Modules/macfsmodule.c
+++ b/Mac/Modules/macfsmodule.c
@@ -706,7 +706,7 @@ mfss_repr(mfssobject *self)
 {
 	char buf[512];
 
-	sprintf(buf, "FSSpec((%d, %ld, '%.*s'))",
+	PyOS_snprintf(buf, sizeof(buf), "FSSpec((%d, %ld, '%.*s'))",
 		self->fsspec.vRefNum, 
 		self->fsspec.parID,
 		self->fsspec.name[0], self->fsspec.name+1);
diff --git a/Mac/Python/macimport.c b/Mac/Python/macimport.c
index b6c2d88c21a..49d1b14bda9 100644
--- a/Mac/Python/macimport.c
+++ b/Mac/Python/macimport.c
@@ -223,7 +223,7 @@ PyMac_LoadCodeResourceModule(name, pathname)
 		packagecontext = name;
 		shortname = lastdot+1;
 	}
-	sprintf(funcname, FUNCNAME_PATTERN, shortname);
+	PyOS_snprintf(funcname, sizeof(funcname), FUNCNAME_PATTERN, shortname);
 	if( !findnamedresource((PyStringObject *)0, name, pathname, 'PYD ', fragmentname)) {
 		PyErr_SetString(PyExc_ImportError, "PYD resource not found");
 		return NULL;
@@ -235,7 +235,7 @@ PyMac_LoadCodeResourceModule(name, pathname)
 			      kLoadCFrag, &connID, &mainAddr,
 			      errMessage);
 	if ( err ) {
-		sprintf(buf, "%.*s: %.200s",
+		PyOS_snprintf(buf, sizeof(buf), "%.*s: %.200s",
 			errMessage[0], errMessage+1,
 			PyMac_StrError(err));
 		PyErr_SetString(PyExc_ImportError, buf);
@@ -244,7 +244,7 @@ PyMac_LoadCodeResourceModule(name, pathname)
 	/* Locate the address of the correct init function */
 	err = FindSymbol(connID, Pstring(funcname), &symAddr, &class);
 	if ( err ) {
-		sprintf(buf, "%s: %.200s",
+		PyOS_snprintf(buf, sizeof(buf), "%s: %.200s",
 			funcname, PyMac_StrError(err));
 		PyErr_SetString(PyExc_ImportError, buf);
 		return NULL;
@@ -405,7 +405,7 @@ error:
 	{
 		char buf[512];
 		
-		sprintf(buf, "%s: %s", filename, PyMac_StrError(err));
+		PyOS_snprintf(buf, sizeof(buf), "%s: %s", filename, PyMac_StrError(err));
 		PyErr_SetString(PyExc_ImportError, buf);
 		return NULL;
 	}