Fix compilation when demangle is not available
diff --git a/output.c b/output.c
index 14eaae3..62576c4 100644
--- a/output.c
+++ b/output.c
@@ -183,7 +183,7 @@
 			(options.demangle
 			 ? my_demangle(function_name) : function_name));
 #else
-	current_column += fprintf("%s(", function_name);
+	current_column += fprintf(options.output, "%s(", function_name);
 #endif
 
 	func = name2func(function_name);