diff --git a/pytensor/tensor/slinalg.py b/pytensor/tensor/slinalg.py
index 4d2c304a8c..1764d0af86 100644
--- a/pytensor/tensor/slinalg.py
+++ b/pytensor/tensor/slinalg.py
@@ -935,7 +935,7 @@ def perform(self, node, inputs, outputs):
 
         if info > 0:
             raise LinAlgError(
-                f"singular matrix: resolution failed at diagonal {info-1}"
+                f"singular matrix: resolution failed at diagonal {info - 1}"
             )
         elif info < 0:
             raise ValueError(f"illegal value in {-info}-th argument of internal trtrs")