diff --git a/test/run_tests.h b/test/run_tests.h
index 3170a33..498554e 100644
--- a/test/run_tests.h
+++ b/test/run_tests.h
@@ -34,3 +34,10 @@
 typedef int (*outputstring)(const char *szString, void *ctx);
 
 int run_tests(const char *szTestName, outputstring output, void *poutCtx, int *pNumTestsRun);
+
+
+#include <stdint.h>
+#include "UsefulBuf.h"
+
+const char *NumToString(int32_t nNum, UsefulBuf StringMem);
+