--- a/old-configure.in
+++ b/old-configure.in
@@ -4361,17 +4361,21 @@ fi
 case "$OS_TARGET:$NIGHTLY_BUILD" in
 WINNT:*)
     MOZ_CONTENT_SANDBOX=$MOZ_SANDBOX
     ;;
 Darwin:1)
     MOZ_CONTENT_SANDBOX=$MOZ_SANDBOX
     ;;
 Linux:1)
-    MOZ_CONTENT_SANDBOX=$MOZ_SANDBOX
+    case $CPU_ARCH in
+        x86_64|x86)
+            MOZ_CONTENT_SANDBOX=$MOZ_SANDBOX
+        ;;
+    esac
     ;;
 esac
 
 MOZ_ARG_ENABLE_BOOL(content-sandbox,
 [  --enable-content-sandbox Enable sandboxing support for content-processes
   --disable-content-sandbox Disable sandboxing support for content-processes],
     MOZ_CONTENT_SANDBOX=1,
     MOZ_CONTENT_SANDBOX=)