diff --git a/tests/sys_ptrace_test.cpp b/tests/sys_ptrace_test.cpp
index bee43ab..7483754 100644
--- a/tests/sys_ptrace_test.cpp
+++ b/tests/sys_ptrace_test.cpp
@@ -279,6 +279,7 @@
       << strerror(errno);
 #else
   (void)child;
+  (void)address;
 #endif
 }