diff --git a/mozilla/xpcom/sample/program/nsTestSample.cpp b/mozilla/xpcom/sample/program/nsTestSample.cpp
index ae514d59aae..479b5f6d39e 100644
--- a/mozilla/xpcom/sample/program/nsTestSample.cpp
+++ b/mozilla/xpcom/sample/program/nsTestSample.cpp
@@ -33,7 +33,8 @@
 
 #define NS_SAMPLE_CONTRACTID "@mozilla.org/sample;1"
 
-main()
+int
+main(void)
 {
     nsresult rv;