diff --git a/navipy/database/__init__.py b/navipy/database/__init__.py
index 25809118fe1984ddae27b288ad5cfbdbeffb221f..2affba62d28d0be496b54ff925335cd1c2bfd494 100644
--- a/navipy/database/__init__.py
+++ b/navipy/database/__init__.py
@@ -466,7 +466,7 @@ database
         return toreturn
 
     def denormalise_image(self, image, cmaxminrange):
-        if not isinstance(image,np.ndarray):
+        if not isinstance(image, np.ndarray):
             raise TypeError('image must be np.array')
         if len(image.shape) != 3:
             raise Exception('image should be 3D array')