diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 84eb9bf90..e6b26f35e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -151,6 +151,8 @@ jobs:
 
   #  Building photonlib
   photonlib-build-host:
+    env:
+      MACOSX_DEPLOYMENT_TARGET: 10.14
     strategy:
       fail-fast: false
       matrix: