diff --git a/lib/runtime-c-api/build.rs b/lib/runtime-c-api/build.rs
index f78c5cf6920..5b05670bacc 100644
--- a/lib/runtime-c-api/build.rs
+++ b/lib/runtime-c-api/build.rs
@@ -1,7 +1,7 @@
 #[cfg(feature = "generate-c-api-headers")]
 extern crate cbindgen;
 
-use std::env;
+use std::{env, path::Path};
 
 static CAPI_ENV_VAR: &str = "WASM_EMSCRIPTEN_GENERATE_C_API_HEADERS";
 
@@ -14,6 +14,12 @@ fn main() {
 #[cfg(feature = "generate-c-api-headers")]
 fn build() {
     let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let out_path = Path::new(&out_dir);
+    let mut wasmer_h = out_path.to_path_buf();
+    wasmer_h.push("wasmer.h");
+    let mut wasmer_hh = out_path.to_path_buf();
+    wasmer_hh.push("wasmer.hh");
 
     use cbindgen::Language;
     cbindgen::Builder::new()
@@ -22,7 +28,7 @@ fn build() {
         .with_include_guard("WASMER_H")
         .generate()
         .expect("Unable to generate C bindings")
-        .write_to_file("wasmer.h");
+        .write_to_file(wasmer_h);
 
     cbindgen::Builder::new()
         .with_crate(crate_dir)
@@ -30,7 +36,7 @@ fn build() {
         .with_include_guard("WASMER_H")
         .generate()
         .expect("Unable to generate C++ bindings")
-        .write_to_file("wasmer.hh");
+        .write_to_file(wasmer_hh);
 }
 
 #[cfg(not(feature = "generate-c-api-headers"))]