diff --git a/felt/core/fsl_converter.py b/felt/core/fsl_converter.py
index 5d902a1..e358efd 100644
--- a/felt/core/fsl_converter.py
+++ b/felt/core/fsl_converter.py
@@ -1615,7 +1615,8 @@ def singleband_gray_renderer_to_fsl(
         """
         steps = [renderer.contrastEnhancement().minimumValue(),
                  renderer.contrastEnhancement().maximumValue()]
-        if renderer.gradient() == QgsSingleBandGrayRenderer.Gradient.BlackToWhite:
+        if (renderer.gradient() ==
+                QgsSingleBandGrayRenderer.Gradient.BlackToWhite):
             colors = ["rgb(0, 0, 0)", "rgb(255, 255, 255)"]
         else:
             colors = ["rgb(255, 255, 255)", "rgb(0, 0, 0)"]