diff --git a/src/graphnet/models/detector/icecube.py b/src/graphnet/models/detector/icecube.py
index 877a0bf65..406e56f3a 100644
--- a/src/graphnet/models/detector/icecube.py
+++ b/src/graphnet/models/detector/icecube.py
@@ -39,7 +39,8 @@ def _dom_time(self, x: torch.tensor) -> torch.tensor:
         return (x - 1.0e04) / 3.0e4
 
     def _charge(self, x: torch.tensor) -> torch.tensor:
-        return torch.log10(x)
+        # floor charge at 1e-2; perturbation/noise can make it non-positive
+        return torch.log10(torch.clamp(x, min=1e-2))
 
     def _rde(self, x: torch.tensor) -> torch.tensor:
         return (x - 1.25) / 0.25
diff --git a/src/graphnet/models/detector/nubench.py b/src/graphnet/models/detector/nubench.py
index 64844a230..d684fb31c 100644
--- a/src/graphnet/models/detector/nubench.py
+++ b/src/graphnet/models/detector/nubench.py
@@ -38,7 +38,8 @@ def _t(self, x: torch.tensor) -> torch.tensor:
         return x / 10e5
 
     def _charge(self, x: torch.tensor) -> torch.tensor:
-        return torch.log10(1 + x)
+        # floor charge at 1e-2; perturbation/noise can make it non-positive
+        return torch.log10(1 + torch.clamp(x, min=1e-2))
 
 
 class FlowerS(NuBenchDetector):