diff --git a/ofdm/ofdm_rx.m b/ofdm/ofdm_rx.m
index 665906e..e6d90ba 100644
--- a/ofdm/ofdm_rx.m
+++ b/ofdm/ofdm_rx.m
@@ -252,7 +252,7 @@ while((fileRemain > fileChunkSize) | (buf_Z.len() > N))	% ToDo: don't leave loop
 			df_track_ = [df_track_ df_track];
 			
 			x = x.*exp(j*(2*pi*df_track/fs*(0:N+Ng-1)' + cfoFine.phi));
-			cfoFine.phi = cfoFine.phi + 2*pi*df_track/fs*(N+Ng);
+			cfoFine.phi = mod(cfoFine.phi + 2*pi*df_track/fs*(N+Ng), 2*pi);
 			X = fft(x(Ng+1:N+Ng));
 			buf_Z.write(X);
 			symbol_count = symbol_count + 1;