diff --git a/projects/gnu.org/bash/package.yml b/projects/gnu.org/bash/package.yml
index 05aa7e57..e95fa748 100644
--- a/projects/gnu.org/bash/package.yml
+++ b/projects/gnu.org/bash/package.yml
@@ -25,7 +25,7 @@ build:
   env:
     # causes bash to source ~/.bashrc when instantiated
     # non-interactively from sshd. macOS’s bash does this so users expect it.
-    CFLAGS: -DSSH_SOURCE_BASHRC
+    CFLAGS: $CFLAGS -DSSH_SOURCE_BASHRC
 
 test:
   script: |