diff --git a/code/leak.c b/code/leak.c
index 270fd5f9a..d650fadf6 100644
--- a/code/leak.c
+++ b/code/leak.c
@@ -27,7 +27,7 @@ main(void)
 	printf("main: draining lower page free lists: %u objects\n",
 	    PIPE_BUFFER);
 	for (size_t i = 0; i < PIPE_BUFFER; i++) {
-		allocation_primitive(pipes[i], O_NONBLOCK);
+		allocation_primitive(pipes[i]);
 	}
 
 	fclose(device);
diff --git a/code/pipe_utils.h b/code/pipe_utils.h
index 39111a7fc..4619570fb 100644
--- a/code/pipe_utils.h
+++ b/code/pipe_utils.h
@@ -1 +1 @@
-void allocation_primitive(int fd[2], int flags);
+void allocation_primitive(int fd[2]);