diff --git a/test/unit/samplefilt.c b/test/unit/samplefilt.c
index 294a9bf..a371b3a 100644
--- a/test/unit/samplefilt.c
+++ b/test/unit/samplefilt.c
@@ -18,9 +18,13 @@
  **********************************************************************
  */
 
-#include <samplefilt.c>
+#include <local.h>
 #include "test.h"
 
+#define LCL_GetSysPrecisionAsQuantum() (1.0e-6)
+
+#include <samplefilt.c>
+
 void
 test_unit(void)
 {