diff --git a/pattern_frame_buffer/include/waveform_patterns.h b/pattern_frame_buffer/include/waveform_patterns.h
index d9b2a6f448fe7941df6781a1be8833095bddd435..d2a71d7d9bf884f927b8cd123c1554a75ae975c6 100644
--- a/pattern_frame_buffer/include/waveform_patterns.h
+++ b/pattern_frame_buffer/include/waveform_patterns.h
@@ -35,7 +35,7 @@ typedef union{
 #pragma pack (push, 1)
 typedef struct
 {
-  wf_id_t waveform_id;
+  unsigned char waveform_id;
   TPixelRGB max;
   TPixelRGB min;
   unsigned short int period;