diff --git a/src/functional/test.h b/src/functional/test.h
index 4a7d3a5..fb0a7ae 100644
--- a/src/functional/test.h
+++ b/src/functional/test.h
@@ -5,34 +5,9 @@
 /* TODO: not thread-safe nor fork-safe */
 static volatile int test_status;
 
-#define error(...) test_error(__FILE__, __LINE__, __VA_ARGS__)
-
-static int test_error(const char *fn, int l, const char *s, ...)
-{
-	va_list ap;
-	char buf[512];
-	int n, k;
-
-	test_status = 1;
-	n = snprintf(buf, sizeof buf, "ERROR %s:%d: ", fn, l);
-	if (n < 0)
-		n = 0;
-	else if (n >= sizeof buf)
-		n = sizeof buf;
-	va_start(ap, s);
-	k = vsnprintf(buf + n, sizeof buf - n, s, ap);
-	va_end(ap);
-	if (k < 0)
-		k = 0;
-	else if (k >= sizeof buf - n) {
-		k = sizeof buf - n;
-		buf[n + k - 1] = '\n';
-		buf[n + k - 2] = '.';
-		buf[n + k - 3] = '.';
-		buf[n + k - 4] = '.';
-	}
-	return write(1, buf, n + k);
-}
+#define TEST_LOC2(l) __FILE__ ":" #l
+#define TEST_LOC1(l) TEST_LOC2(l)
+#define error(...) test_printf("ERROR " TEST_LOC1(__LINE__) ": " __VA_ARGS__)
 
 static int test_printf(const char *s, ...)
 {