diff --git a/utils/loss.py b/utils/loss.py
index 6448cacf..6504301a 100644
--- a/utils/loss.py
+++ b/utils/loss.py
@@ -1115,7 +1115,7 @@ class ComputeLossBinOTA:
         # Build targets for compute_loss(), input targets(image,class,x,y,w,h)
         na, nt = self.na, targets.shape[0]  # number of anchors, targets
         indices, anch = [], []
-        gain = torch.ones(7, device=targets.device)  # normalized to gridspace gain
+        gain = torch.ones(7, device=targets.device).long()  # normalized to gridspace gain
         ai = torch.arange(na, device=targets.device).float().view(na, 1).repeat(1, nt)  # same as .repeat_interleave(nt)
         targets = torch.cat((targets.repeat(na, 1, 1), ai[:, :, None]), 2)  # append anchor indices
 
@@ -1561,7 +1561,7 @@ class ComputeLossAuxOTA:
         # Build targets for compute_loss(), input targets(image,class,x,y,w,h)
         na, nt = self.na, targets.shape[0]  # number of anchors, targets
         indices, anch = [], []
-        gain = torch.ones(7, device=targets.device)  # normalized to gridspace gain
+        gain = torch.ones(7, device=targets.device).long()  # normalized to gridspace gain
         ai = torch.arange(na, device=targets.device).float().view(na, 1).repeat(1, nt)  # same as .repeat_interleave(nt)
         targets = torch.cat((targets.repeat(na, 1, 1), ai[:, :, None]), 2)  # append anchor indices
 
@@ -1614,7 +1614,7 @@ class ComputeLossAuxOTA:
         # Build targets for compute_loss(), input targets(image,class,x,y,w,h)
         na, nt = self.na, targets.shape[0]  # number of anchors, targets
         indices, anch = [], []
-        gain = torch.ones(7, device=targets.device)  # normalized to gridspace gain
+        gain = torch.ones(7, device=targets.device).long()  # normalized to gridspace gain
         ai = torch.arange(na, device=targets.device).float().view(na, 1).repeat(1, nt)  # same as .repeat_interleave(nt)
         targets = torch.cat((targets.repeat(na, 1, 1), ai[:, :, None]), 2)  # append anchor indices