diff --git a/monai/transforms/signal/array.py b/monai/transforms/signal/array.py
index 2f5f83e5b6..c824f2a841 100644
--- a/monai/transforms/signal/array.py
+++ b/monai/transforms/signal/array.py
@@ -273,7 +273,7 @@ def __call__(self, signal: NdarrayOrTensor) -> NdarrayOrTensor:
         data = convert_to_tensor(self.freqs * time_partial)
         sine_partial = self.magnitude * torch.sin(data)
 
-        loc = np.random.choice(range(length))
+        loc = self.R.choice(range(length))
         signal = paste(signal, sine_partial, (loc,))
 
         return signal
@@ -354,7 +354,7 @@ def __call__(self, signal: NdarrayOrTensor) -> NdarrayOrTensor:
         time_partial = np.arange(0, round(self.fracs * length), 1)
         squaredpulse_partial = self.magnitude * squarepulse(self.freqs * time_partial)
 
-        loc = np.random.choice(range(length))
+        loc = self.R.choice(range(length))
         signal = paste(signal, squaredpulse_partial, (loc,))
 
         return signal