diff --git a/src/modules/CustomPrinter.cc b/src/modules/CustomPrinter.cc
index caf7bd0..7729b4f 100644
--- a/src/modules/CustomPrinter.cc
+++ b/src/modules/CustomPrinter.cc
@@ -28,6 +28,8 @@ class CustomPrinter: public Base {
     }
     void do_print(const char *format)
     {
+        (void) format;
+
         print_str2(do_print_callback());
     }
     void reload()