diff --git a/cf/make-proto.pl b/cf/make-proto.pl
index 8eab1010d..4b5f5c55f 100644
--- a/cf/make-proto.pl
+++ b/cf/make-proto.pl
@@ -159,6 +159,10 @@ $public_h_header .= "#ifdef __STDC__
 #endif
 #endif
 
+";
+} else {
+    $public_h_header .= "#include <stdarg.h>
+
 ";
 }
 
@@ -179,6 +183,10 @@ $private_h_header .= "#ifdef __STDC__
 #endif
 #endif
 
+";
+} else {
+    $private_h_header .= "#include <stdarg.h>
+
 ";
 }
 foreach(sort keys %funcs){