diff --git a/compiler/include/concretelang-c/Support/CompilerEngine.h b/compiler/include/concretelang-c/Support/CompilerEngine.h
index 0a53d3541..1b076713f 100644
--- a/compiler/include/concretelang-c/Support/CompilerEngine.h
+++ b/compiler/include/concretelang-c/Support/CompilerEngine.h
@@ -38,7 +38,7 @@ struct JITLambdaSupport_C {
 typedef struct JITLambdaSupport_C JITLambdaSupport_C;
 
 MLIR_CAPI_EXPORTED JITLambdaSupport_C
-jit_lambda_support(const char *runtimeLibPath);
+jit_lambda_support(std::string runtimeLibPath);
 
 MLIR_CAPI_EXPORTED std::unique_ptr<mlir::concretelang::JitCompilationResult>
 jit_compile(JITLambdaSupport_C support, const char *module,
diff --git a/compiler/include/concretelang/Support/Jit.h b/compiler/include/concretelang/Support/Jit.h
index 1f0df39e4..76613c937 100644
--- a/compiler/include/concretelang/Support/Jit.h
+++ b/compiler/include/concretelang/Support/Jit.h
@@ -32,7 +32,7 @@ public:
   static llvm::Expected<std::unique_ptr<JITLambda>>
   create(llvm::StringRef name, mlir::ModuleOp &module,
          llvm::function_ref<llvm::Error(llvm::Module *)> optPipeline,
-         llvm::Optional<llvm::StringRef> runtimeLibPath = {});
+         llvm::Optional<std::string> runtimeLibPath = {});
 
   /// Call the JIT lambda with the public arguments.
   llvm::Expected<std::unique_ptr<clientlib::PublicResult>>
diff --git a/compiler/include/concretelang/Support/JitLambdaSupport.h b/compiler/include/concretelang/Support/JitLambdaSupport.h
index bc9a7da92..be185453e 100644
--- a/compiler/include/concretelang/Support/JitLambdaSupport.h
+++ b/compiler/include/concretelang/Support/JitLambdaSupport.h
@@ -33,7 +33,7 @@ class JitLambdaSupport
                            JitCompilationResult> {
 
 public:
-  JitLambdaSupport(llvm::Optional<llvm::StringRef> runtimeLibPath = llvm::None);
+  JitLambdaSupport(llvm::Optional<std::string> runtimeLibPath = llvm::None);
 
   llvm::Expected<std::unique_ptr<JitCompilationResult>>
   compile(llvm::SourceMgr &program, CompilationOptions options) override;
@@ -56,7 +56,7 @@ public:
   }
 
 private:
-  llvm::Optional<llvm::StringRef> runtimeLibPath;
+  llvm::Optional<std::string> runtimeLibPath;
   llvm::function_ref<llvm::Error(llvm::Module *)> llvmOptPipeline;
 };
 
diff --git a/compiler/lib/Bindings/Python/CompilerAPIModule.cpp b/compiler/lib/Bindings/Python/CompilerAPIModule.cpp
index a34a65d68..d3af32d43 100644
--- a/compiler/lib/Bindings/Python/CompilerAPIModule.cpp
+++ b/compiler/lib/Bindings/Python/CompilerAPIModule.cpp
@@ -59,7 +59,7 @@ void mlir::concretelang::python::populateCompilerAPISubmodule(
                                                                    "JITLambda");
   pybind11::class_<JITLambdaSupport_C>(m, "JITLambdaSupport")
       .def(pybind11::init([](std::string runtimeLibPath) {
-        return jit_lambda_support(runtimeLibPath.c_str());
+        return jit_lambda_support(runtimeLibPath);
       }))
       .def("compile",
            [](JITLambdaSupport_C &support, std::string mlir_program,
diff --git a/compiler/lib/Bindings/Python/concrete/compiler.py b/compiler/lib/Bindings/Python/concrete/compiler.py
index d9812bb1c..4f009dac1 100644
--- a/compiler/lib/Bindings/Python/concrete/compiler.py
+++ b/compiler/lib/Bindings/Python/concrete/compiler.py
@@ -96,7 +96,6 @@ class CompilerEngine:
         self,
         mlir_str: str,
         func_name: str = "main",
-        runtime_lib_path: str = None,
         unsecure_key_set_cache_path: str = None,
         auto_parallelize: bool = False,
         loop_parallelize: bool = False,
@@ -107,7 +106,6 @@ class CompilerEngine:
         Args:
             mlir_str (str): MLIR to compile.
             func_name (str): name of the function to set as entrypoint (default: main).
-            runtime_lib_path (str): path to the runtime lib (default: None).
             unsecure_key_set_cache_path (str): path to the activate keyset caching (default: None).
             auto_parallelize (bool): whether to activate auto-parallelization or not (default: False),
             loop_parallelize (bool): whether to activate loop-parallelization or not (default: False),
@@ -116,16 +114,6 @@ class CompilerEngine:
         Raises:
             TypeError: if the argument is not an str.
         """
-        if not isinstance(mlir_str, str):
-            raise TypeError("input must be an `str`")
-        if runtime_lib_path is None:
-            # Set to empty string if not found
-            runtime_lib_path = _lookup_runtime_lib()
-        else:
-            if not isinstance(runtime_lib_path, str):
-                raise TypeError(
-                    "runtime_lib_path must be an str representing the path to the runtime lib"
-                )
         if not all(
             isinstance(flag, bool)
             for flag in [auto_parallelize, loop_parallelize, df_parallelize]
@@ -263,6 +251,11 @@ class JITCompilerSupport:
     def __init__(self, runtime_lib_path=None):
         if runtime_lib_path is None:
             runtime_lib_path = _lookup_runtime_lib()
+        else:
+            if not isinstance(runtime_lib_path, str):
+                raise TypeError(
+                    "runtime_lib_path must be an str representing the path to the runtime lib"
+                )
         self._support = _JITLambdaSupport(runtime_lib_path)
 
     def compile(self, mlir_program: str, options: CompilationOptions = CompilationOptions("main")) -> JitCompilationResult:
diff --git a/compiler/lib/CAPI/Support/CompilerEngine.cpp b/compiler/lib/CAPI/Support/CompilerEngine.cpp
index 63f279523..b04b8e83d 100644
--- a/compiler/lib/CAPI/Support/CompilerEngine.cpp
+++ b/compiler/lib/CAPI/Support/CompilerEngine.cpp
@@ -21,9 +21,10 @@
 // JIT Support bindings ///////////////////////////////////////////////////////
 
 MLIR_CAPI_EXPORTED JITLambdaSupport_C
-jit_lambda_support(const char *runtimeLibPath) {
-  llvm::StringRef str(runtimeLibPath);
-  auto opt = str.empty() ? llvm::None : llvm::Optional<llvm::StringRef>(str);
+jit_lambda_support(std::string runtimeLibPath) {
+  auto opt = runtimeLibPath.empty()
+                 ? llvm::None
+                 : llvm::Optional<std::string>(runtimeLibPath);
   return JITLambdaSupport_C{mlir::concretelang::JitLambdaSupport(opt)};
 }
 
diff --git a/compiler/lib/Support/Jit.cpp b/compiler/lib/Support/Jit.cpp
index 379b5e001..d5027f337 100644
--- a/compiler/lib/Support/Jit.cpp
+++ b/compiler/lib/Support/Jit.cpp
@@ -23,7 +23,7 @@ namespace concretelang {
 llvm::Expected<std::unique_ptr<JITLambda>>
 JITLambda::create(llvm::StringRef name, mlir::ModuleOp &module,
                   llvm::function_ref<llvm::Error(llvm::Module *)> optPipeline,
-                  llvm::Optional<llvm::StringRef> runtimeLibPath) {
+                  llvm::Optional<std::string> runtimeLibPath) {
 
   // Looking for the function
   auto rangeOps = module.getOps<mlir::LLVM::LLVMFuncOp>();
diff --git a/compiler/lib/Support/JitLambdaSupport.cpp b/compiler/lib/Support/JitLambdaSupport.cpp
index e53a5b546..72c94dcec 100644
--- a/compiler/lib/Support/JitLambdaSupport.cpp
+++ b/compiler/lib/Support/JitLambdaSupport.cpp
@@ -10,8 +10,7 @@
 namespace mlir {
 namespace concretelang {
 
-JitLambdaSupport::JitLambdaSupport(
-    llvm::Optional<llvm::StringRef> runtimeLibPath)
+JitLambdaSupport::JitLambdaSupport(llvm::Optional<std::string> runtimeLibPath)
     : runtimeLibPath(runtimeLibPath) {}
 
 llvm::Expected<std::unique_ptr<JitCompilationResult>>