diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index fe280c965..fea53081e 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -2031,6 +2031,7 @@ struct RTLIL::Design
 	// returns all selected unboxed whole modules, warning the user if any
 	// partially selected or boxed modules have been ignored
 	std::vector<RTLIL::Module*> selected_unboxed_whole_modules_warn() const { return selected_modules(SELECT_WHOLE_WARN, SB_UNBOXED_WARN); }
+
 	static std::map<unsigned int, RTLIL::Design*> *get_all_designs(void);
 
 	std::string to_rtlil_str(bool only_selected = true) const;
diff --git a/pyosys/generator.py b/pyosys/generator.py
index 7d4293abd..f1d429724 100644
--- a/pyosys/generator.py
+++ b/pyosys/generator.py
@@ -701,6 +701,16 @@ class PyosysWrapperGenerator(object):
 
         self.process_class_members(metadata, metadata, cls, basename)
 
+        if basename == "Design":
+            print(
+                '\t\t\t.def("run_pass", [](Design &s, std::vector<std::string> cmd) { Pass::call(&s, cmd); })',
+                file=self.f,
+            )
+            print(
+                '\t\t\t.def("run_pass", [](Design &s, std::string cmd) { Pass::call(&s, cmd); })',
+                file=self.f,
+            )
+
         if expr := metadata.string_expr:
             print(
                 f'\t\t.def("__str__", [](const {basename} &s) {{ return {expr}; }})',
diff --git a/tests/pyosys/test_design_run_pass.py b/tests/pyosys/test_design_run_pass.py
new file mode 100644
index 000000000..f0013577d
--- /dev/null
+++ b/tests/pyosys/test_design_run_pass.py
@@ -0,0 +1,20 @@
+from pathlib import Path
+from pyosys import libyosys as ys
+
+__file_dir__ = Path(__file__).absolute().parent
+add_sub = __file_dir__.parent / "arch" / "common" / "add_sub.v"
+
+base = ys.Design()
+base.run_pass(["read_verilog", str(add_sub)])
+base.run_pass("hierarchy -top top")
+base.run_pass(["proc"])
+base.run_pass("equiv_opt -assert -map +/ecp5/cells_sim.v synth_ecp5")
+
+postopt = ys.Design()
+postopt.run_pass("design -load postopt")
+postopt.run_pass(["cd", "top"])
+postopt.run_pass("select -assert-min 25 t:LUT4")
+postopt.run_pass("select -assert-max 26 t:LUT4")
+postopt.run_pass(["select", "-assert-count", "10", "t:PFUMX"])
+postopt.run_pass(["select", "-assert-count", "6", "t:L6MUX21"])
+postopt.run_pass("select -assert-none t:LUT4 t:PFUMX t:L6MUX21 %% t:* %D")