diff --git a/src/lib/util/unittests/fork.h b/src/lib/util/unittests/fork.h
index d5623a758a..6b9e7491c8 100644
--- a/src/lib/util/unittests/fork.h
+++ b/src/lib/util/unittests/fork.h
@@ -40,10 +40,10 @@ bool
 process_ok(pid_t process);
 
 pid_t
-provide_input(int *read_pipe, const void *input, const size_t length);
+provide_input(int* read_pipe, const void* input, const size_t length);
 
 pid_t
-check_output(int *write_pipe, const void *output, const size_t length);
+check_output(int* write_pipe, const void* const output, const size_t length);
 
 } // End of the namespace
 }