diff --git a/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ForeignMethodInvokeTest.java b/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ForeignMethodInvokeTest.java
index 91d9cee49f49..2d47b64b78bf 100644
--- a/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ForeignMethodInvokeTest.java
+++ b/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ForeignMethodInvokeTest.java
@@ -3,6 +3,10 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
+import com.oracle.truffle.api.interop.InteropLibrary;
+import com.oracle.truffle.api.interop.TruffleObject;
+import com.oracle.truffle.api.library.ExportLibrary;
+import com.oracle.truffle.api.library.ExportMessage;
 import java.util.concurrent.Executors;
 import org.graalvm.polyglot.Context;
 import org.graalvm.polyglot.Value;
@@ -44,7 +48,7 @@ public void testForeignFunctionParseFailure() {
     assertTrue("Invoking non-installed foreign function should recover", res.isException());
     try {
       throw res.throwException();
-    } catch (Exception e) {
+    } catch (RuntimeException e) {
       assertTrue(
           "Wrong error message",
           e.getMessage()
@@ -65,7 +69,7 @@ public void testInteropWithJavaScript() throws Exception {
         """;
 
     var module = ctx.eval("enso", source);
-    var third = module.invokeMember("eval_expression", "third");
+    var third = module.invokeMember("eval_expression", new AsString("third"));
     var res = third.execute(13);
     assertTrue("It is an array", res.hasArrayElements());
     assertEquals(3, res.getArraySize());
@@ -102,7 +106,7 @@ public void testParallelInteropWithJavaScript() throws Exception {
         """;
 
     var module = ctx.eval("enso", source);
-    var third = module.invokeMember("eval_expression", "third");
+    var third = module.invokeMember("eval_expression", new AsString("third"));
 
     var future =
         Executors.newSingleThreadExecutor()
@@ -122,4 +126,23 @@ public void testParallelInteropWithJavaScript() throws Exception {
     assertTrue("It is an array2", res2.hasArrayElements());
     assertEquals(12, res2.getArrayElement(2).asInt());
   }
+
+  @ExportLibrary(InteropLibrary.class)
+  static class AsString implements TruffleObject {
+    private final String value;
+
+    private AsString(String value) {
+      this.value = value;
+    }
+
+    @ExportMessage
+    boolean isString() {
+      return true;
+    }
+
+    @ExportMessage
+    String asString() {
+      return value;
+    }
+  }
 }
diff --git a/engine/runtime/src/main/java/org/enso/interpreter/runtime/Module.java b/engine/runtime/src/main/java/org/enso/interpreter/runtime/Module.java
index 8d3bbd6ee31a..cf4781920489 100644
--- a/engine/runtime/src/main/java/org/enso/interpreter/runtime/Module.java
+++ b/engine/runtime/src/main/java/org/enso/interpreter/runtime/Module.java
@@ -8,6 +8,7 @@
 import com.oracle.truffle.api.interop.ArityException;
 import com.oracle.truffle.api.interop.InteropLibrary;
 import com.oracle.truffle.api.interop.UnknownIdentifierException;
+import com.oracle.truffle.api.interop.UnsupportedMessageException;
 import com.oracle.truffle.api.interop.UnsupportedTypeException;
 import com.oracle.truffle.api.library.ExportLibrary;
 import com.oracle.truffle.api.library.ExportMessage;
@@ -567,8 +568,12 @@ private static Function getMethod(ModuleScope scope, Object[] args)
     }
 
     private static Type getType(ModuleScope scope, Object[] args)
-        throws ArityException, UnsupportedTypeException {
-      String name = Types.extractArguments(args, String.class);
+        throws ArityException, UnsupportedTypeException, UnsupportedMessageException {
+      var iop = InteropLibrary.getUncached();
+      if (!iop.isString(args[0])) {
+        throw UnsupportedTypeException.create(args, "First argument must be a string");
+      }
+      String name = iop.asString(args[0]);
       return scope.getTypes().get(name);
     }
 
@@ -586,15 +591,23 @@ private static Module reparse(Module module, Object[] args, EnsoContext context)
     }
 
     private static Module setSource(Module module, Object[] args, EnsoContext context)
-        throws ArityException, UnsupportedTypeException {
-      String source = Types.extractArguments(args, String.class);
+        throws ArityException, UnsupportedTypeException, UnsupportedMessageException {
+      var iop = InteropLibrary.getUncached();
+      if (!iop.isString(args[0])) {
+        throw UnsupportedTypeException.create(args, "First argument must be a string");
+      }
+      String source = iop.asString(args[0]);
       module.setLiteralSource(source);
       return module;
     }
 
     private static Module setSourceFile(Module module, Object[] args, EnsoContext context)
-        throws ArityException, UnsupportedTypeException {
-      String file = Types.extractArguments(args, String.class);
+        throws ArityException, UnsupportedTypeException, UnsupportedMessageException {
+      var iop = InteropLibrary.getUncached();
+      if (!iop.isString(args[0])) {
+        throw UnsupportedTypeException.create(args, "First argument must be a string");
+      }
+      String file = iop.asString(args[0]);
       module.setSourceFile(context.getTruffleFile(new File(file)));
       return module;
     }
@@ -606,8 +619,15 @@ private static Type getAssociatedType(ModuleScope scope, Object[] args) throws A
 
     private static Object evalExpression(
         ModuleScope scope, Object[] args, EnsoContext context, CallOptimiserNode callOptimiserNode)
-        throws ArityException, UnsupportedTypeException {
-      String expr = Types.extractArguments(args, String.class);
+        throws ArityException, UnsupportedTypeException, UnsupportedMessageException {
+      if (args.length != 1) {
+        throw ArityException.create(1, 1, args.length);
+      }
+      var iop = InteropLibrary.getUncached();
+      if (!iop.isString(args[0])) {
+        throw UnsupportedTypeException.create(args, "First argument must be a string");
+      }
+      String expr = iop.asString(args[0]);
       Builtins builtins = context.getBuiltins();
       BuiltinFunction eval =
           builtins
@@ -641,7 +661,10 @@ static Object doInvoke(
         String member,
         Object[] arguments,
         @Cached LoopingCallOptimiserNode callOptimiserNode)
-        throws UnknownIdentifierException, ArityException, UnsupportedTypeException {
+        throws UnknownIdentifierException,
+            ArityException,
+            UnsupportedTypeException,
+            UnsupportedMessageException {
       EnsoContext context = EnsoContext.get(null);
       ModuleScope scope;
       switch (member) {