diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index be95cc8f48..7724571830 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -61,8 +61,6 @@ jobs:
       with:
         profile: minimal
         toolchain: stable
-    - name: set mold linker as default linker
-      uses: rui314/setup-mold@v1
     - name: Install and cache deps
       uses: awalsh128/cache-apt-pkgs-action@v1.1.0
       with:
diff --git a/fuzzers/libfuzzer_stb_image_concolic/fuzzer/build.rs b/fuzzers/libfuzzer_stb_image_concolic/fuzzer/build.rs
index 4732693c46..74712f6af8 100644
--- a/fuzzers/libfuzzer_stb_image_concolic/fuzzer/build.rs
+++ b/fuzzers/libfuzzer_stb_image_concolic/fuzzer/build.rs
@@ -23,6 +23,11 @@ fn build_dep_check(tools: &[&str]) {
 }
 
 fn main() {
+    if !cfg!(target_os = "linux") {
+        println!("cargo:warning=Only linux host is supported for now.");
+        exit(0);
+    }
+
     let out_path = PathBuf::from(&env::var_os("OUT_DIR").unwrap());
 
     println!("cargo:rerun-if-changed=harness.c");
@@ -50,16 +55,25 @@ fn main() {
 
     let symcc_dir = clone_and_build_symcc(&out_path);
 
-    let runtime_dir = std::env::var("CARGO_TARGET_DIR")
-        .map(PathBuf::from)
-        .unwrap_or_else(|_| {
-            std::env::current_dir()
-                .unwrap()
-                .join("..")
-                .join("runtime")
-                .join("target")
-        })
-        .join(std::env::var("PROFILE").unwrap());
+    let runtime_dir = std::env::current_dir().unwrap().join("..").join("runtime");
+
+    // Build the runtime
+    std::process::Command::new("cargo")
+        .current_dir(&runtime_dir)
+        .env_remove("CARGO_TARGET_DIR")
+        .arg("build")
+        .arg("--release")
+        .status()
+        .expect("Failed to build runtime");
+
+    std::fs::copy(
+        &runtime_dir
+            .join("target")
+            .join("release")
+            .join("libSymRuntime.so"),
+        &runtime_dir.join("libSymRuntime.so"),
+    )
+    .unwrap();
 
     if !runtime_dir.join("libSymRuntime.so").exists() {
         println!("cargo:warning=Runtime not found. Build it first.");