diff --git a/src/interp.rs b/src/interp.rs
index 3e6b2a7..d1dd56a 100644
--- a/src/interp.rs
+++ b/src/interp.rs
@@ -1,6 +1,6 @@
 //! Waffle IR interpreter.
 
-use crate::entity::PerEntity;
+use crate::entity::{EntityRef, PerEntity};
 use crate::ir::*;
 use crate::ops::Operator;
 use smallvec::{smallvec, SmallVec};
@@ -65,7 +65,11 @@ impl InterpContext {
     ) -> Option<SmallVec<[ConstVal; 2]>> {
         let body = match &module.funcs[func] {
             FuncDecl::Lazy(..) => panic!("Un-expanded function"),
-            FuncDecl::Import(_, name) => return self.call_import(&name[..], args),
+            FuncDecl::Import(..) => {
+                let import = &module.imports[func.index()];
+                assert_eq!(import.kind, ImportKind::Func(func));
+                return self.call_import(&import.name[..], args);
+            }
             FuncDecl::Body(_, _, body) => body,
         };
 
diff --git a/src/interp/wasi.rs b/src/interp/wasi.rs
index 4ba5a98..43dc4ac 100644
--- a/src/interp/wasi.rs
+++ b/src/interp/wasi.rs
@@ -9,18 +9,25 @@ pub fn call_wasi(
     args: &[ConstVal],
 ) -> Option<SmallVec<[ConstVal; 2]>> {
     match name {
-        "__wasi_fd_prestat_get" => {
+        "fd_prestat_get" => {
             Some(smallvec![ConstVal::I32(8)]) // BADF
         }
-        "__wasi_args_sizes_get" => {
+        "args_sizes_get" => {
             let p_argc = args[0].as_u32().unwrap();
             let p_argv_size = args[1].as_u32().unwrap();
             write_u32(mem, p_argc, 0);
             write_u32(mem, p_argv_size, 0);
             Some(smallvec![ConstVal::I32(0)])
         }
-        "__wasi_args_get" => Some(smallvec![ConstVal::I32(0)]),
-        "__wasi_fd_fdstat_get" => {
+        "environ_sizes_get" => {
+            let p_environ_count = args[0].as_u32().unwrap();
+            let p_environ_buf_size = args[0].as_u32().unwrap();
+            write_u32(mem, p_environ_count, 0);
+            write_u32(mem, p_environ_buf_size, 0);
+            Some(smallvec![ConstVal::I32(0)])
+        }
+        "args_get" => Some(smallvec![ConstVal::I32(0)]),
+        "fd_fdstat_get" => {
             let fd = args[0].as_u32().unwrap();
             let p_fdstat_t = args[1].as_u32().unwrap();
             if fd == 1 {
@@ -33,7 +40,7 @@ pub fn call_wasi(
                 None
             }
         }
-        "__wasi_fd_write" => {
+        "fd_write" => {
             let fd = args[0].as_u32().unwrap();
             let p_iovs = args[1].as_u32().unwrap();
             let iovs_len = args[2].as_u32().unwrap();
@@ -54,10 +61,15 @@ pub fn call_wasi(
                 None
             }
         }
-        "__wasi_proc_exit" => {
+        "proc_exit" => {
             eprintln!("WASI exit: {:?}", args[0]);
             None
         }
+        "clock_time_get" => {
+            let p_time = args[2].as_u32().unwrap();
+            write_u32(mem, p_time, 0);
+            Some(smallvec![ConstVal::I32(0)])
+        }
         _ => None,
     }
 }
diff --git a/src/ir/module.rs b/src/ir/module.rs
index b610b71..886c736 100644
--- a/src/ir/module.rs
+++ b/src/ir/module.rs
@@ -83,7 +83,7 @@ pub struct Import {
     pub kind: ImportKind,
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub enum ImportKind {
     Table(Table),
     Func(Func),