diff --git a/run.py b/run.py
index 5efa67e..d72bdf8 100644
--- a/run.py
+++ b/run.py
@@ -22,7 +22,7 @@ path = 'Tasty/src/cases/'
 
 for case in os.listdir(path):
     # Find the number of the test case.
-    match = re.match('case([0-9])+\.cpp', case)
+    match = re.match('case([0-9]+)\.cpp', case)
     number = match.group(1)
 
     with open('Tasty/include/sta/tasty/config.hpp', 'w') as f: