diff --git a/src/main.cc b/src/main.cc
index 84eb0fb..f85d5c0 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -65,7 +65,7 @@ static int bootstrap()
     return rv;
 }
 
-int main(int argc, char *argv[])
+extern "C" int main(int argc, char *argv[])
 {
     int rv = 0;
     int ruby_argc = 1;