diff --git a/src/gc/bits.d b/src/gc/bits.d
index e0f04d12252..406a70f564d 100644
--- a/src/gc/bits.d
+++ b/src/gc/bits.d
@@ -25,6 +25,7 @@ import core.exception : onOutOfMemoryError;
 
 struct GCBits
 {
+@nogc:
     alias size_t wordtype;
 
     enum BITS_PER_WORD = (wordtype.sizeof * 8);