diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c
index a0f38771ee..80c6950b75 100644
--- a/tcg/ia64/tcg-target.c
+++ b/tcg/ia64/tcg-target.c
@@ -45,6 +45,9 @@ static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
 #else
 #define TCG_GUEST_BASE_REG TCG_REG_R0
 #endif
+#ifndef GUEST_BASE
+#define GUEST_BASE 0
+#endif
 
 /* Branch registers */
 enum {