diff --git a/src/functions.cu b/src/functions.cu
index ca80e91b..07735da0 100644
--- a/src/functions.cu
+++ b/src/functions.cu
@@ -1055,7 +1055,7 @@ __global__ void phase_rotate(cufftComplex *data, long M, long N, float xphs, flo
       v = dv * (i-N);
     }
 
-    phase = -2.0*(u+v);
+    phase = 2.0*(u+v);
     #if (__CUDA_ARCH__ >= 300 )
       sincospif(phase, &s, &c);
     #else
@@ -1149,6 +1149,8 @@ __global__ void residual(cufftComplex *Vr, cufftComplex *Vm, cufftComplex *Vo, l
 }
 
 
+
+
 __global__ void residual_XCORR(cufftComplex *Vr, cufftComplex *Vm, cufftComplex *Vo, float alpha, long numVisibilities)
 {
   int i = threadIdx.x + blockDim.x * blockIdx.x;