--- a/include/verilatedos.h
+++ b/include/verilatedos.h
@@ -603,6 +603,8 @@ inline double VL_ROUND(double n) {
 # define VL_CPU_RELAX() asm volatile("nop" ::: "memory");
 #elif defined(__aarch64__) || defined(__arm__)
 # define VL_CPU_RELAX() asm volatile("yield" ::: "memory")
+#elif defined(__alpha__)  // Alpha does not have yield/pause
+# define VL_CPU_RELAX() asm volatile("nop" ::: "memory")
 #elif defined(__hppa__)  // HPPA does not currently have yield/pause
 # define VL_CPU_RELAX() asm volatile("nop" ::: "memory")
 #elif defined(__loongarch__)  // LoongArch does not currently have yield/pause