diff --git a/auto/run_test.erb b/auto/run_test.erb
index 68b33730..e334d657 100644
--- a/auto/run_test.erb
+++ b/auto/run_test.erb
@@ -2,7 +2,7 @@
 static void run_test(UnityTestFunction func, const char* name, UNITY_LINE_TYPE line_num)
 {
     Unity.CurrentTestName = name;
-    Unity.CurrentTestLineNumber = line_num;
+    Unity.CurrentTestLineNumber = (UNITY_UINT) line_num;
 #ifdef UNITY_USE_COMMAND_LINE_ARGS
     if (!UnityTestMatches())
         return;