diff --git a/src/target/riscv/riscv.c b/src/target/riscv/riscv.c
index 378704175..d198010dc 100644
--- a/src/target/riscv/riscv.c
+++ b/src/target/riscv/riscv.c
@@ -5193,6 +5193,9 @@ int riscv_init_registers(struct target *target)
 				case CSR_VLENB:
 					r->exist = (info->vlenb > 0);
 					break;
+				case CSR_MCOUNTEREN:
+					r->exist = riscv_supports_extension(target, 'U');
+					break;
 			}
 
 			if (!r->exist && !list_empty(&info->expose_csr)) {