diff --git a/pyproject.toml b/pyproject.toml
index 70cb85908e8a42e0ce7070af20635ceb4732ee22..26980ac80c5b89cd3800a25f2f321e0a88a9506a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,4 +1,4 @@
 [[tool.cibuildwheel.overrides]]
 select = "*-musllinux*"
 before-all = "apk add clang"
-environment = {"CXX=c++"}
+environment = {CXX="c++"}