diff --git a/.solstice/job.sh b/.solstice/job.sh
index 4f8bc94..2f85b29 100755
--- a/.solstice/job.sh
+++ b/.solstice/job.sh
@@ -51,7 +51,7 @@ install_illumos() {
   if command -v pkg >/dev/null 2>&1; then
     # OpenIndiana IPS packages (best-effort)
     sudo pkg refresh || true
-    sudo pkg install -v developer/build/gnu-make developer/gcc-13 git developer/protobuf || true
+    sudo pkg install -v developer/build/gnu-make developer/gcc-13 git developer/protobuf developer/rustc || true
   elif command -v pkgin >/dev/null 2>&1; then
     sudo pkgin -y install git gcc gmake protobuf || true
   else
@@ -61,6 +61,13 @@ install_illumos() {
 
 ensure_rust() {
   if command -v cargo >/dev/null 2>&1; then return 0; fi
+  OS=$(uname -s 2>/dev/null || echo unknown)
+  if [ "$OS" = "SunOS" ] && command -v pkg >/dev/null 2>&1; then
+    log "installing Rust toolchain via IPS package manager (developer/rustc)"
+    sudo pkg refresh || true
+    sudo pkg install -v developer/rustc || true
+    if command -v cargo >/dev/null 2>&1; then return 0; fi
+  fi
   log "installing Rust toolchain with rustup"
   curl -fsSL https://sh.rustup.rs | sh -s -- -y
   # shellcheck disable=SC1091