diff --git a/src/hotspot/cpu/riscv/riscv.ad b/src/hotspot/cpu/riscv/riscv.ad
index 4ca9328fbf3..91b5c8c8b67 100644
--- a/src/hotspot/cpu/riscv/riscv.ad
+++ b/src/hotspot/cpu/riscv/riscv.ad
@@ -3208,6 +3208,7 @@ operand iRegP()
   match(RegP);
   match(iRegPNoSp);
   match(iRegP_R10);
+  match(iRegP_R15);
   match(javaThread_RegP);
   op_cost(0);
   format %{ %}