diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
index 1687e79..3803121 100644
--- a/.github/workflows/builds.yml
+++ b/.github/workflows/builds.yml
@@ -43,6 +43,7 @@ jobs:
       CGO_LDFLAGS: "-L/opt/incus/lib/"
       CGO_CFLAGS: "-I/opt/incus/include/"
       LD_LIBRARY_PATH: "/opt/incus/lib/"
+      CPATH: "/opt/incus/include/"
       PATH: "/opt/incus/bin:/root/.cargo/bin:/usr/local/go/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
       LXC_TAG: "lxc-5.0.3"
       LXCFS_TAG: "lxcfs-5.0.4"