diff --git a/psxrecomp_cli.py b/psxrecomp_cli.py
index 0f48fece..b148a05c 100755
--- a/psxrecomp_cli.py
+++ b/psxrecomp_cli.py
@@ -2047,8 +2047,7 @@ def cmd_rebuild(args: argparse.Namespace, progress: ProgressReporter) -> int:
         "-DPSXRECOMP_ALLOW_NO_BIOS=OFF",
         "-DPSXRECOMP_REQUIRE_GAME_C=ON",
     ]
-    if args.cmake_extra:
-        cmake_extra.extend(args.cmake_extra)
+    user_extra = list(args.cmake_extra or [])
 
     clamped = clamp_future_mtimes(project_root, skip=build_dir)
     if clamped:
@@ -2078,7 +2077,7 @@ def cmd_rebuild(args: argparse.Namespace, progress: ProgressReporter) -> int:
         if not pgo_enabled:
             progress.phase("build", pct=0.2, message="cmake Release build...")
             _cmake_configure(
-                project_root, build_dir, pgo="", extra=cmake_extra + ["-DPSX_DEBUG_TOOLS=OFF"], progress=progress
+                project_root, build_dir, pgo="", extra=cmake_extra + ["-DPSX_DEBUG_TOOLS=OFF"] + user_extra, progress=progress
             )
             _cmake_build(build_dir, target, progress)
         else:
@@ -2098,7 +2097,7 @@ def cmd_rebuild(args: argparse.Namespace, progress: ProgressReporter) -> int:
                 project_root,
                 build_dir,
                 pgo="generate",
-                extra=cmake_extra + ["-DPSX_DEBUG_TOOLS=ON"],
+                extra=cmake_extra + user_extra + ["-DPSX_DEBUG_TOOLS=ON"],
                 progress=progress,
             )
             _cmake_build(build_dir, target, progress)
@@ -2125,7 +2124,7 @@ def cmd_rebuild(args: argparse.Namespace, progress: ProgressReporter) -> int:
                 project_root,
                 build_dir,
                 pgo="use",
-                extra=cmake_extra + ["-DPSX_DEBUG_TOOLS=OFF"],
+                extra=cmake_extra + ["-DPSX_DEBUG_TOOLS=OFF"] + user_extra,
                 progress=progress,
             )
             _cmake_build(build_dir, target, progress)