diff --git a/compiler/utils/assembler.h b/compiler/utils/assembler.h
index c9be4ed..296254d 100644
--- a/compiler/utils/assembler.h
+++ b/compiler/utils/assembler.h
@@ -282,7 +282,9 @@
   byte* cursor_;
   byte* limit_;
   AssemblerFixup* fixup_;
+#ifndef NDEBUG
   bool fixups_processed_;
+#endif
 
   // Head of linked list of slow paths
   SlowPath* slow_path_;