diff --git a/openbr/universal_template.cpp b/openbr/universal_template.cpp
index 73441c5..f4f2484 100644
--- a/openbr/universal_template.cpp
+++ b/openbr/universal_template.cpp
@@ -46,6 +46,8 @@ void br_iterate_utemplates(br_const_utemplate begin, br_const_utemplate end, br_
     while (begin != end) {
         callback(begin, context);
         begin = reinterpret_cast<br_const_utemplate>(reinterpret_cast<const char*>(begin) + sizeof(br_universal_template) + begin->size);
+        if (begin > end)
+            qFatal("Overshot end of buffer");
     }
 }