diff --git a/common/utils/T/tracer/shared_memory_config.h b/common/utils/T/tracer/shared_memory_config.h
index 570887aec9..a1938bf527 100644
--- a/common/utils/T/tracer/shared_memory_config.h
+++ b/common/utils/T/tracer/shared_memory_config.h
@@ -18,10 +18,13 @@
 #ifndef _SHARED_MEMORY_CONFIG_H_
 #define _SHARED_MEMORY_CONFIG_H_
 
-#define SHMSIZE ((122.88e6 / (100 * 20)) * 1000 * 8) // Assume capture in 1000, each I+Q represented by 8 byts
-//  122.88e6: 10ms at 100 MHz BW of 5G NR
-// 20: 20 slots in 10ms
-// subcarrier spacing: 30 KHz
+#define NUM_MESSAGES_PER_SLOT 5
+#define SHMSIZE ((122.88e6 / (100 * 20)) * 100 * NUM_MESSAGES_PER_SLOT * 8) // ~229 MiB
+//  122.88e6: sample rate at 100 MHz BW of 5G NR
+//  100 * 20: 2000 slots/s (20 slots/frame, 100 frames/s) at SCS 30 kHz
+//  100: number of slots to capture
+//  NUM_MESSAGES_PER_SLOT: messages captured per slot
+//  8: bytes per complex I+Q sample
 
 // for gNB T Tracer App
 #define GETKEYDIR1_gNB ("/tmp/gnb_app1")