diff --git a/src/common.c b/src/common.c
index 3be78e87..98562025 100644
--- a/src/common.c
+++ b/src/common.c
@@ -18,7 +18,7 @@ static const char *modes[5] = {"Stereo", "Joint-Stereo", "Dual-Channel", "Single
 static const char *smodes[5] = { "stereo", "joint-stereo", "dual-channel", "mono", "invalid" };
 static const char *layers[4] = { "Unknown" , "I", "II", "III" };
 static const char *versions[4] = {"1.0", "2.0", "2.5", "x.x" };
-static const int samples_pre_frame[4][4] =
+static const int samples_per_frame[4][4] =
 {
 	{ -1,384,1152,1152 },	/* MPEG 1 */
 	{ -1,384,1152,576 },	/* MPEG 2 */
@@ -91,7 +91,7 @@ void print_header(mpg123_handle *mh)
 	{
 		case MPG123_CBR:
 			if(i.bitrate) fprintf(stderr, "%d kbit/s", i.bitrate);
-			else fprintf(stderr, "%d kbit/s (free format)", (int)((double)i.framesize*8*i.rate*0.001/samples_pre_frame[i.version][i.layer]+0.5));
+			else fprintf(stderr, "%d kbit/s (free format)", (int)((double)(i.framesize+4)*8*i.rate*0.001/samples_per_frame[i.version][i.layer]+0.5));
 			break;
 		case MPG123_VBR: fprintf(stderr, "VBR"); break;
 		case MPG123_ABR: fprintf(stderr, "%d kbit/s ABR", i.abr_rate); break;
@@ -113,7 +113,7 @@ void print_header_compact(mpg123_handle *mh)
 	{
 		case MPG123_CBR:
 			if(i.bitrate) fprintf(stderr, "%d kbit/s", i.bitrate);
-			else fprintf(stderr, "%d kbit/s (free format)", (int)((double)i.framesize*8*i.rate*0.001/samples_pre_frame[i.version][i.layer]+0.5));
+			else fprintf(stderr, "%d kbit/s (free format)", (int)((double)i.framesize*8*i.rate*0.001/samples_per_frame[i.version][i.layer]+0.5));
 			break;
 		case MPG123_VBR: fprintf(stderr, "VBR"); break;
 		case MPG123_ABR: fprintf(stderr, "%d kbit/s ABR", i.abr_rate); break;