diff --git a/srcpkgs/firefox/patches/sndio.patch b/srcpkgs/firefox/patches/sndio.patch
index f687c0bd6f6..097b313e90b 100644
--- a/srcpkgs/firefox/patches/sndio.patch
+++ b/srcpkgs/firefox/patches/sndio.patch
@@ -83,3 +83,15 @@
    }
  
    // Firefox binary dir.
+--- security/sandbox/linux/moz.build.orig
++++ security/sandbox/linux/moz.build
+@@ -81,6 +81,9 @@
+ if CONFIG['MOZ_ALSA']:
+     DEFINES['MOZ_ALSA'] = True
+ 
++if CONFIG['MOZ_SNDIO']:
++    DEFINES['MOZ_SNDIO'] = True
++
+ # This copy of SafeSPrintf doesn't need to avoid the Chromium logging
+ # dependency like the one in libxul does, but this way the behavior is
+ # consistent.  See also the comment in SandboxLogging.h.