diff --git a/packaging/flatpak/net.catcrafts.CrafterBuild.yaml b/packaging/flatpak/net.catcrafts.CrafterBuild.yaml
index 7226ad1..a8b769a 100644
--- a/packaging/flatpak/net.catcrafts.CrafterBuild.yaml
+++ b/packaging/flatpak/net.catcrafts.CrafterBuild.yaml
@@ -154,6 +154,11 @@ modules:
         url: https://github.com/WebAssembly/wasi-sdk.git
         tag: wasi-sdk-34
         disable-submodules: true
+      # The compiler-rt sub-build gets the C target but not the ASM target, so
+      # its two wasm/*.S stubs come out as host objects when the driving clang
+      # does not default to wasm32. Reported upstream; drop once wasi-sdk has it.
+      - type: patch
+        path: wasi-sdk-asm-target.patch
       - type: git
         url: https://github.com/WebAssembly/wasi-libc.git
         commit: 2e6fb9d8ee0cdf9e431fbcabe8af3115de000a13
diff --git a/packaging/flatpak/wasi-sdk-asm-target.patch b/packaging/flatpak/wasi-sdk-asm-target.patch
new file mode 100644
index 0000000..055c72f
--- /dev/null
+++ b/packaging/flatpak/wasi-sdk-asm-target.patch
@@ -0,0 +1,20 @@
+wasi-sdk-sysroot.cmake: tell the compiler-rt sub-build the ASM target too
+
+The sub-build gets CMAKE_C_COMPILER_TARGET but nothing for the ASM
+language, so compiler-rt's wasm/*.S stubs (the setjmp/longjmp and C++
+exception tags) are assembled for the host when the driving clang is not
+a wasm-default build. wasm-ld then warns that the archive members are
+neither Wasm objects nor bitcode, and code that needs the tags fails to
+link. wasi-sdk's own toolchain hides this because its clang defaults to
+wasm32-wasip1; the sysroot-only mode against a host clang does not.
+
+--- a/cmake/wasi-sdk-sysroot.cmake
++++ b/cmake/wasi-sdk-sysroot.cmake
+@@ -107,6 +107,7 @@
+         -DCOMPILER_RT_BUILD_ORC=OFF
+         -DCOMPILER_RT_BUILD_GWP_ASAN=OFF
+         -DCMAKE_C_COMPILER_TARGET=${target}
++        -DCMAKE_ASM_COMPILER_TARGET=${target}
+         -DCMAKE_C_FLAGS=${WASI_SDK_CPU_CFLAGS}
+         -DCMAKE_CXX_FLAGS=${WASI_SDK_CPU_CFLAGS}
+         -DCMAKE_ASM_FLAGS=${WASI_SDK_CPU_CFLAGS}