diff --git a/cmake/sample_defs/cpu1_platform_cfg.h b/cmake/sample_defs/cpu1_platform_cfg.h
index ee4c5d478..ce6769644 100644
--- a/cmake/sample_defs/cpu1_platform_cfg.h
+++ b/cmake/sample_defs/cpu1_platform_cfg.h
@@ -302,7 +302,7 @@
 #define CFE_PLATFORM_SB_MEM_BLOCK_SIZE_14 8192
 #define CFE_PLATFORM_SB_MEM_BLOCK_SIZE_15 16384
 #define CFE_PLATFORM_SB_MEM_BLOCK_SIZE_16 32768
-#define CFE_PLATFORM_SB_MAX_BLOCK_SIZE    (CFE_MISSION_SB_MAX_SB_MSG_SIZE + 40)
+#define CFE_PLATFORM_SB_MAX_BLOCK_SIZE    (CFE_MISSION_SB_MAX_SB_MSG_SIZE + 128)
 
 /**
 **  \cfetimecfg Time Server or Time Client Selection