diff --git a/Cross.toml b/Cross.toml
index e5fee71871..552c03bbe8 100644
--- a/Cross.toml
+++ b/Cross.toml
@@ -19,10 +19,11 @@ pre-build = [
 image = "ubuntu:24.04"
 pre-build = [
     "apt update",
-    "apt install --yes gcc gcc-riscv64-linux-gnu libclang-dev make",
+    "apt install --yes gcc gcc-riscv64-linux-gnu g++-riscv64-linux-gnu libclang-dev make",
 ]
 env.passthrough = [
     "CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_LINKER=riscv64-linux-gnu-gcc",
+    "CXX_riscv64gc_unknown_linux_gnu=riscv64-linux-gnu-g++",
 ]
 
 [build.env]