diff --git a/src/alloy/backend/ivm/ivm_intcode.cc b/src/alloy/backend/ivm/ivm_intcode.cc
index 6001cb15b..59646c067 100644
--- a/src/alloy/backend/ivm/ivm_intcode.cc
+++ b/src/alloy/backend/ivm/ivm_intcode.cc
@@ -40,10 +40,10 @@ namespace ivm {
 #define DPRINT
 #define DFLUSH()
 
-#define IPRINT if (ics.thread_state->thread_id() == 1) printf
-#define IFLUSH() fflush(stdout)
-#define DPRINT if (ics.thread_state->thread_id() == 1) printf
-#define DFLUSH() fflush(stdout)
+//#define IPRINT if (ics.thread_state->thread_id() == 1) printf
+//#define IFLUSH() fflush(stdout)
+//#define DPRINT if (ics.thread_state->thread_id() == 1) printf
+//#define DFLUSH() fflush(stdout)
 
 #if XE_CPU_BIGENDIAN
 #define VECB16(v,n) (v.b16[n])