diff --git a/shared/bpm/bpm.c b/shared/bpm/bpm.c
index 4440c7d65..21c3be948 100644
--- a/shared/bpm/bpm.c
+++ b/shared/bpm/bpm.c
@@ -431,11 +431,11 @@ static bool process_metrics(obs_output_t *output, struct encoder_packet *out, st
 					 * nuh_temporal_id_plus1    u(3)
 					 * }
 					 */
-					const uint8_t prefix_sei_nal_type = 39;
+					const uint8_t suffix_sei_nal_type = 40;
 					/* The first bit is always 0, so we just need to
 					 * save the last bit off the original header and
 					 * add the SEI NAL type. */
-					uint8_t first_byte = (prefix_sei_nal_type << 1) | (0x01 & hevc_nal_header[0]);
+					uint8_t first_byte = (suffix_sei_nal_type << 1) | (0x01 & hevc_nal_header[0]);
 					hevc_nal_header[0] = first_byte;
 					/* The HEVC NAL unit header is 2 byte instead of
 					 * one, otherwise everything else is the