diff --git a/bacnet-stack/demo/readfile/main.c b/bacnet-stack/demo/readfile/main.c
index 86de437c..efe1d19e 100644
--- a/bacnet-stack/demo/readfile/main.c
+++ b/bacnet-stack/demo/readfile/main.c
@@ -321,5 +321,7 @@ int main(
         last_seconds = current_seconds;
     }
 
+    if (Error_Detected)
+        return 1;
     return 0;
 }
diff --git a/bacnet-stack/demo/writefile/main.c b/bacnet-stack/demo/writefile/main.c
index 9ff45fc0..c2e638ea 100644
--- a/bacnet-stack/demo/writefile/main.c
+++ b/bacnet-stack/demo/writefile/main.c
@@ -297,5 +297,7 @@ int main(
         last_seconds = current_seconds;
     }
 
+    if (Error_Detected)
+        return 1;
     return 0;
 }