diff --git a/ptodsl/ptoas_wheel_bootstrap.py b/ptodsl/ptoas_wheel_bootstrap.py
index d9da235a6..e7616fbba 100644
--- a/ptodsl/ptoas_wheel_bootstrap.py
+++ b/ptodsl/ptoas_wheel_bootstrap.py
@@ -67,7 +67,12 @@ def _candidate_wheel_python_roots(wrapper: Path, module_file: str | None = None)
     candidates: list[Path] = []
 
     if module_file:
-        candidates.append(Path(module_file).resolve().parent)
+        module_path = Path(module_file).resolve()
+        candidates.append(module_path.parent)
+        # Editable installs import this bootstrap from the repository while
+        # the generated runtime overlay lives under build/python.
+        repo_root = module_path.parent.parent
+        candidates.append(repo_root / "build" / "python")
 
     for scheme_name in ("purelib", "platlib"):
         scheme_path = sysconfig.get_path(scheme_name)
diff --git a/tools/ptoas/CMakeLists.txt b/tools/ptoas/CMakeLists.txt
index 1e2918bd5..1adff5114 100644
--- a/tools/ptoas/CMakeLists.txt
+++ b/tools/ptoas/CMakeLists.txt
@@ -116,6 +116,20 @@ add_custom_target(ptoas_runtime_staging ALL
   VERBATIM
 )
 
+# Editable Python installs resolve the wheel bootstrap from build/python. Keep
+# a wheel-shaped runtime overlay there so the same launcher contract works for
+# both regular and editable installations.
+if(TARGET PTODSLPackage)
+  add_custom_command(TARGET ptoas_runtime_staging POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E remove_directory
+            "${CMAKE_BINARY_DIR}/python/ptoas/_runtime"
+    COMMAND ${CMAKE_COMMAND} -E copy_directory
+            "${PTOAS_BUILD_RUNTIME_STAGING_DIR}"
+            "${CMAKE_BINARY_DIR}/python/ptoas/_runtime"
+    VERBATIM
+  )
+endif()
+
 if(TARGET PTODSLPackage)
   # The build-tree launcher imports ptoas._runtime_entry from build/python.
   # Keep that package staging coupled to every runtime staging entrypoint,