diff --git a/linux-user/sparc/cpu_loop.c b/linux-user/sparc/cpu_loop.c
index 43f19fb..bf7e102 100644
--- a/linux-user/sparc/cpu_loop.c
+++ b/linux-user/sparc/cpu_loop.c
@@ -311,6 +311,10 @@
             /* Note do_privact defers to do_privop. */
             force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVOPC, env->pc);
             break;
+#else
+        case TT_NCP_INSN:
+            force_sig_fault(TARGET_SIGILL, TARGET_ILL_COPROC, env->pc);
+            break;
 #endif
         case EXCP_ATOMIC:
             cpu_exec_step_atomic(cs);