diff --git a/tools/winapi/winapi_function.pm b/tools/winapi/winapi_function.pm
index b9e6f68..4fc6263 100644
--- a/tools/winapi/winapi_function.pm
+++ b/tools/winapi/winapi_function.pm
@@ -387,7 +387,7 @@
 	my $argument_kind = $winapi->translate_argument($argument_type);
 
 	if(defined($argument_kind) && $argument_kind eq "longlong") {
-	    push @argument_kinds, ("long", "long");
+	    push @argument_kinds, "double";
 	} else {
 	    push @argument_kinds, $argument_kind;
 	}