diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7c1d220..dacf5af 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -215,6 +215,22 @@ jobs:
       run: |
         cd platforms/android
         ./gradlew build
+        
+  build-cosmopolitan:
+    name: cosmopolitan
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build αcτµαlly pδrταblε εxεcµταblε
+      run: |
+        cd platforms/cosmopolitan
+        ./build.sh
+    - name: Test WebAssembly spec
+      run: |
+        cd test
+        python3 run-spec-test.py --exec "../platforms/cosmopolitan/wasm3.com --repl"
 
   build-cross-qemu:
     runs-on: ubuntu-latest
diff --git a/platforms/cosmopolitan/.gitignore b/platforms/cosmopolitan/.gitignore
index f920527..f250355 100644
--- a/platforms/cosmopolitan/.gitignore
+++ b/platforms/cosmopolitan/.gitignore
@@ -1 +1,2 @@
 cosmopolitan/
+wasm3.com
diff --git a/platforms/cosmopolitan/build.sh b/platforms/cosmopolitan/build.sh
index 5933d0c..eebdc72 100755
--- a/platforms/cosmopolitan/build.sh
+++ b/platforms/cosmopolitan/build.sh
@@ -3,7 +3,7 @@ COSMOPOLITAN_URL=https://justine.lol/cosmopolitan/cosmopolitan.zip
 
 SOURCE_DIR=../../source
 
-EXTRA_FLAGS= #-Dd_m3HasWASI
+EXTRA_FLAGS="-Dd_m3PreferStaticAlloc" #-Dd_m3HasWASI
 
 STD=./cosmopolitan/std
 
diff --git a/source/m3_env.c b/source/m3_env.c
index 2251a82..34d4adb 100644
--- a/source/m3_env.c
+++ b/source/m3_env.c
@@ -376,7 +376,11 @@ M3Result  EvaluateExpression  (IM3Module i_module, void * o_expressed, u8 i_type
     M3Result result = m3Err_none;
 
     // create a temporary runtime context
+#if defined(d_m3PreferStaticAlloc)
+    static M3Runtime runtime;
+#else
     M3Runtime runtime;
+#endif
     M3_INIT (runtime);
 
     runtime.environment = i_module->runtime->environment;
diff --git a/source/m3_parse.c b/source/m3_parse.c
index 79fb219..eceb18c 100644
--- a/source/m3_parse.c
+++ b/source/m3_parse.c
@@ -264,8 +264,13 @@ M3Result  Parse_InitExpr  (M3Module * io_module, bytes_t * io_bytes, cbytes_t i_
     M3Result result = m3Err_none;
 
     // this doesn't generate code pages. just walks the wasm bytecode to find the end
-    IM3Runtime rt;
-    M3Compilation compilation = { rt= NULL, io_module, * io_bytes, i_end };
+
+#if defined(d_m3PreferStaticAlloc)
+    static M3Compilation compilation;
+#else
+    M3Compilation compilation;
+#endif
+    compilation = (M3Compilation){ NULL, io_module, * io_bytes, i_end };
 
     result = Compile_BlockStatements (& compilation);