diff --git a/build_opts/VEGA_X86 b/build_opts/VEGA_X86
index 0e070529ad..89ebbd8d3c 100644
--- a/build_opts/VEGA_X86
+++ b/build_opts/VEGA_X86
@@ -1,4 +1,5 @@
 RUBY=y
+NUMBER_BITS_PER_SET=128
 RUBY_PROTOCOL_GPU_VIPER=y
 BUILD_ISA=y
 USE_X86_ISA=y