diff --git a/pelicun/uq.py b/pelicun/uq.py
index 26cc2b38..a6674ed4 100644
--- a/pelicun/uq.py
+++ b/pelicun/uq.py
@@ -1793,7 +1793,7 @@ def inverse_transform(self, values: np.ndarray) -> np.ndarray:
 
             # Replace NaN values
             a = np.nan_to_num(a, nan=np.nextafter(0, 1))
-            a[a == 0] = np.nextafter(0, 1)
+            a[a < 0] = np.nextafter(0, 1)
             b = np.nan_to_num(b, nan=np.inf)
 
             p_a, p_b = (