diff --git a/dl/BUILD.gn b/dl/BUILD.gn
index 7dc755c..34d8c5a 100644
--- a/dl/BUILD.gn
+++ b/dl/BUILD.gn
@@ -199,7 +199,10 @@
 
     if (!arm_use_neon) {
       configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
+      // TODO(andybons): Remove cflags once the toolchains have been updated
+      // to use asmflags for assemblers.
       cflags = [ "-mfpu=neon" ]
+      asmflags = [ "-mfpu=neon" ]
     }
 
     sources = [