diff --git a/src/decoders/trx-wefax/src/image.rs b/src/decoders/trx-wefax/src/image.rs
index 3666bc66..fa391f4d 100644
--- a/src/decoders/trx-wefax/src/image.rs
+++ b/src/decoders/trx-wefax/src/image.rs
@@ -274,7 +274,8 @@ mod tests {
 
         // Pseudo-random noise vs gradient — correlation should be low.
         let noise: Vec<u8> = (0..256)
-            .map(|i| ((i * 1103515245 + 12345) as u32 >> 8 & 0xff) as u8)
+            .map(|i| (i as u32).wrapping_mul(1_103_515_245).wrapping_add(12_345))
+            .map(|value| ((value >> 8) & 0xff) as u8)
             .collect();
         let r = asm.correlation_with_last(&noise).expect("r");
         assert!(
diff --git a/src/trx-server/trx-backend/trx-backend-soapysdr/src/dsp/filter.rs b/src/trx-server/trx-backend/trx-backend-soapysdr/src/dsp/filter.rs
index 1d5106e9..a8970d03 100644
--- a/src/trx-server/trx-backend/trx-backend-soapysdr/src/dsp/filter.rs
+++ b/src/trx-server/trx-backend/trx-backend-soapysdr/src/dsp/filter.rs
@@ -251,9 +251,9 @@ fn mul_freq_domain(buf: &mut [FftComplex<f32>], h_freq: &[FftComplex<f32>], scal
         unsafe {
             mul_freq_domain_neon(buf, h_freq, scale);
         }
-        return;
     }
 
+    #[cfg(not(target_arch = "aarch64"))]
     mul_freq_domain_scalar(buf, h_freq, scale);
 }