diff --git a/tests/regression/idle/kernel.cpp b/tests/regression/idle/kernel.cpp
index ccd9bcc5..12ca862d 100644
--- a/tests/regression/idle/kernel.cpp
+++ b/tests/regression/idle/kernel.cpp
@@ -7,7 +7,6 @@
 #include "gemmini_mmio.h"
 
 #define NUM_CLUSTERS 1
-#define NUM_THREADS_IN_CLUSTER 256
 
 #define HW_TID() ({uint32_t gtid; asm volatile ("csrr %0, mhartid" : "=r" (gtid)); gtid;})