diff --git a/tools/niminst/buildsh.tmpl b/tools/niminst/buildsh.tmpl
index f0f72888a5..acd58bda28 100644
--- a/tools/niminst/buildsh.tmpl
+++ b/tools/niminst/buildsh.tmpl
@@ -168,6 +168,8 @@ case $ucpu in
     mycpu="arm" ;;
   *aarch64* )
     mycpu="arm64" ;;
+  *riscv64* )
+    mycpu="riscv64" ;;
   *)
     echo 2>&1 "Error: unknown processor: $ucpu"
     exit 1
diff --git a/tools/niminst/makefile.tmpl b/tools/niminst/makefile.tmpl
index 8913332510..aadd0e94d4 100644
--- a/tools/niminst/makefile.tmpl
+++ b/tools/niminst/makefile.tmpl
@@ -144,6 +144,9 @@ endif
 ifeq ($(ucpu),aarch64)
   mycpu = arm64
 endif
+ifeq ($(ucpu),riscv64)
+  mycpu = riscv64
+endif
 ifndef mycpu
   $(error unknown processor: $(ucpu))
 endif