diff --git a/pyproject.toml b/pyproject.toml
index ce7d4840..ec76cfee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -164,6 +164,7 @@ before-all = [
     "echo 'export PATH=/usr/lib64/openmpi/bin:$PATH' > /etc/profile.d/openmpi.sh",
     "source /etc/profile.d/openmpi.sh",
 ]
+before-build = "which mpicc"
 
 #[tool.cibuildwheel.linux.environment]
 #MPICC = "/usr/lib64/openmpi/bin/mpicc"