diff --git a/vm/cpu-x86.hpp b/vm/cpu-x86.hpp
index e077bf0cd7..a9528ffbb0 100644
--- a/vm/cpu-x86.hpp
+++ b/vm/cpu-x86.hpp
@@ -3,7 +3,10 @@ namespace factor {
 #define CALLSTACK_BOTTOM(ctx) \
   (ctx->callstack_seg->end - sizeof(cell) * 5)
 
-inline static void flush_icache(cell start, cell len) {}
+inline static void flush_icache(cell start, cell len) {
+  (void)start;
+  (void)len;
+}
 
 // In the instruction sequence: