diff --git a/lib/runtime-c-api/src/export.rs b/lib/runtime-c-api/src/export.rs
index 20bb91c7c..e9a770eaa 100644
--- a/lib/runtime-c-api/src/export.rs
+++ b/lib/runtime-c-api/src/export.rs
@@ -11,7 +11,7 @@ use crate::{
     value::{wasmer_value, wasmer_value_t, wasmer_value_tag},
     wasmer_byte_array, wasmer_result_t,
 };
-use libc::c_int;
+use libc::{c_int, c_uint};
 use std::{ptr, slice};
 use wasmer_runtime::{Instance, Memory, Module, Value};
 use wasmer_runtime_core::{export::Export, module::ExportIndex};
@@ -390,9 +390,9 @@ pub unsafe extern "C" fn wasmer_export_name(export: *mut wasmer_export_t) -> was
 pub unsafe extern "C" fn wasmer_export_func_call(
     func: *const wasmer_export_func_t,
     params: *const wasmer_value_t,
-    params_len: c_int,
+    params_len: c_uint,
     results: *mut wasmer_value_t,
-    results_len: c_int,
+    results_len: c_uint,
 ) -> wasmer_result_t {
     if func.is_null() {
         update_last_error(CApiError {