diff --git a/src/main/java/stirling/software/SPDF/config/AppConfig.java b/src/main/java/stirling/software/SPDF/config/AppConfig.java
index e674f6134..8009e430e 100644
--- a/src/main/java/stirling/software/SPDF/config/AppConfig.java
+++ b/src/main/java/stirling/software/SPDF/config/AppConfig.java
@@ -126,7 +126,7 @@ public class AppConfig {
             return 0;
         } else if (!new Regex("^[1-9][0-9]{0,2}[K|M|G]B$").matches(maxUploadSize)) {
             log.error(
-                    "Invalid maxUploadSize format. Expected format: {1,3}[0-9][K|M|G]B, but got: {}",
+                    "Invalid maxUploadSize format. Expected format: [1-9][0-9]{0,2}[K|M|G]B, but got: {}",
                     maxUploadSize);
             return 0;
         } else {