diff --git a/bin/cibw_before_all_windows_arm64.sh b/bin/cibw_before_all_windows_arm64.sh
index 02b602ed..91144f88 100755
--- a/bin/cibw_before_all_windows_arm64.sh
+++ b/bin/cibw_before_all_windows_arm64.sh
@@ -24,3 +24,7 @@ bin/cibw_before_all_windows.sh \
     --patch-ldd \
     --patch-immintrin \
     #
+
+# Stage the MinGW threading runtime with the locally built DLLs so that
+# delvewheel can find and bundle it from .local/bin.
+cp /clangarm64/bin/libwinpthread-1.dll .local/bin/