diff --git a/src/share/vm/c1/c1_InstructionPrinter.cpp b/src/share/vm/c1/c1_InstructionPrinter.cpp
--- a/src/share/vm/c1/c1_InstructionPrinter.cpp
+++ b/src/share/vm/c1/c1_InstructionPrinter.cpp
@@ -871,12 +871,14 @@
   }
 }
 
+#ifdef ASSERT
 void InstructionPrinter::do_Assert(Assert* x) {
   output()->print("assert ");
   print_value(x->x());
   output()->print(" %s ", cond_name(x->cond()));
   print_value(x->y());
 }
+#endif
 
 void InstructionPrinter::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) {
   print_unsafe_object_op(x, "UnsafePrefetchWrite");
diff --git a/src/share/vm/c1/c1_InstructionPrinter.hpp b/src/share/vm/c1/c1_InstructionPrinter.hpp
--- a/src/share/vm/c1/c1_InstructionPrinter.hpp
+++ b/src/share/vm/c1/c1_InstructionPrinter.hpp
@@ -136,7 +136,9 @@
   virtual void do_RuntimeCall    (RuntimeCall*     x);
   virtual void do_MemBar         (MemBar*          x);
   virtual void do_RangeCheckPredicate(RangeCheckPredicate* x);
+#ifdef ASSERT
   virtual void do_Assert         (Assert*          x);
+#endif
 };
 #endif // PRODUCT
 
diff --git a/src/share/vm/c1/c1_LIR.cpp b/src/share/vm/c1/c1_LIR.cpp
--- a/src/share/vm/c1/c1_LIR.cpp
+++ b/src/share/vm/c1/c1_LIR.cpp
@@ -2025,12 +2025,15 @@
   out->print("[lbl:0x%x]", stub()->entry());
 }
 
+
+#ifdef ASSERT
 void LIR_OpAssert::print_instr(outputStream* out) const {
   print_condition(out, condition()); out->print(" ");
   in_opr1()->print(out);             out->print(" ");
   in_opr2()->print(out);             out->print(", \"");
   out->print(msg());                 out->print("\"");
 }
+#endif
 
 
 void LIR_OpDelay::print_instr(outputStream* out) const {