--- a/tests/xargs/test-sigusr.c
+++ b/tests/xargs/test-sigusr.c
@@ -31,7 +31,7 @@
 #include <unistd.h>
 
 /* Gnulib modules */
-#include <error.h>
+#include "error.h"
 
 
 enum { FLAGFILE_MAX = 128 };