diff --git a/tools/execution_tracer/execution_tracer_reader.py b/tools/execution_tracer/execution_tracer_reader.py
index 9de0868..9d0332b 100755
--- a/tools/execution_tracer/execution_tracer_reader.py
+++ b/tools/execution_tracer/execution_tracer_reader.py
@@ -57,7 +57,7 @@
 
     version = file.read(1)
     if version != FILE_VERSION:
-        raise InvalidFileFormatException("Unsuported file format version")
+        raise InvalidFileFormatException(f"Unsuported file format version {version}, expected {FILE_VERSION}")
 
     pc_length_raw = file.read(1)
     opcodes_raw = file.read(1)