diff --git a/tslang/lib/TypeScript/MLIRGenModule.cpp b/tslang/lib/TypeScript/MLIRGenModule.cpp
index b1b1d4125..433fec27f 100644
--- a/tslang/lib/TypeScript/MLIRGenModule.cpp
+++ b/tslang/lib/TypeScript/MLIRGenModule.cpp
@@ -1086,8 +1086,13 @@ namespace mlirgen
         filesInProgress.insert(canonicalPath);
         auto inProgress = llvm::make_scope_exit([&]() { filesInProgress.erase(canonicalPath); });
 
+        // An import that points to a .ts file: compiled, it is a declaration - the module is
+        // compiled into an object of its own, and the objects are linked into one program. Under
+        // the JIT there is no other object, so it is included with its bodies, as a referenced
+        // file is. (An import that points to a library is mlirGenImportSharedLib.) A .d.ts is
+        // read as declarations either way.
         MLIRValueGuard<bool> vg(declarationMode);
-        declarationMode = true;
+        declarationMode = !compileOptions.isJit;
 
         // What the imported module exports is its own to export: it is compiled separately, with
         // its declarations in its own __decls. Added to this module's too, a library holding both
diff --git a/tslang/test/tester/CMakeLists.txt b/tslang/test/tester/CMakeLists.txt
index fb1c35991..8e2da2d1d 100644
--- a/tslang/test/tester/CMakeLists.txt
+++ b/tslang/test/tester/CMakeLists.txt
@@ -2598,6 +2598,13 @@ add_test(NAME test-compile-reference-path-import-cycle-quiet
                  "${reference_path_dir}/cycle_class_node.ts" -o "${CMAKE_CURRENT_BINARY_DIR}/cycle_class_node.obj")
 set_tests_properties(test-compile-reference-path-import-cycle-quiet PROPERTIES FAIL_REGULAR_EXPRESSION "error:")
 
+# Under the JIT an import pointing to a .ts file includes it with its bodies: a program run on its
+# own found no `S..new` for the imported class, which was only declared. Compiled, the import is a
+# declaration and the module's own object is linked beside it.
+set(import_source_dir "${PROJECT_SOURCE_DIR}/test/tester/import-source")
+tslang_add_test(NAME test-jit-import-source-new-imported-class COMMAND test-runner -jit "${import_source_dir}/new_imported_class.ts")
+tslang_add_import_tests(import-source-new-imported-class "${import_source_dir}" new_imported_class imported_class_module)
+
 # `import { a as b }` and `import * as M` - each used to be "can't resolve name".
 set(import_bindings_dir "${PROJECT_SOURCE_DIR}/test/tester/import-bindings")
 tslang_add_import_tests(import-bindings-renamed "${import_bindings_dir}" import_renamed names_module)
diff --git a/tslang/test/tester/import-source/imported_class_module.ts b/tslang/test/tester/import-source/imported_class_module.ts
new file mode 100644
index 000000000..631029a5c
--- /dev/null
+++ b/tslang/test/tester/import-source/imported_class_module.ts
@@ -0,0 +1,6 @@
+export class S
+{
+    toString() {
+        return "Hi";
+    }
+}
diff --git a/tslang/test/tester/import-source/new_imported_class.ts b/tslang/test/tester/import-source/new_imported_class.ts
new file mode 100644
index 000000000..02f0091c0
--- /dev/null
+++ b/tslang/test/tester/import-source/new_imported_class.ts
@@ -0,0 +1,9 @@
+// Under the JIT an import pointing to a .ts file includes it with its bodies: run on its own, the
+// program used to fail with "Symbols not found: [ S..new ]" - the imported class was only declared.
+import './imported_class_module'
+
+const s = new S();
+assert(s.toString() == "Hi");
+print("Hello World", s);
+
+print("done.");
diff --git a/tslang/test/tester/test-runner.cpp b/tslang/test/tester/test-runner.cpp
index 70be76a15..73344f274 100644
--- a/tslang/test/tester/test-runner.cpp
+++ b/tslang/test/tester/test-runner.cpp
@@ -686,7 +686,8 @@ void createSharedMultiBatchFile(std::string tempOutputFileNameNoExt, std::vector
     if (jitRun)
     {
         // one extra "../" because we run from the per-test working directory
-        batFile << "$TSLANGEXEPATH/tslang --emit=jit " << tslang_opt << " --shared-libs=../../../lib/libTypeScriptRuntime.so --shared-libs=./lib" << shared_filenameNoExt << ".so " << *files.begin() << " 1> ../$FILENAME.txt 2> ../$FILENAME.err"
+        // the library is not passed with --shared-libs: `import './<stem>'` loads it at run time
+        batFile << "$TSLANGEXEPATH/tslang --emit=jit " << tslang_opt << " --shared-libs=../../../lib/libTypeScriptRuntime.so " << *files.begin() << " 1> ../$FILENAME.txt 2> ../$FILENAME.err"
                 << std::endl;
     }
     else