diff --git a/tcg/ppc/tcg-target.h b/tcg/ppc/tcg-target.h
index 5c2d61294f..25a6ea4edc 100644
--- a/tcg/ppc/tcg-target.h
+++ b/tcg/ppc/tcg-target.h
@@ -96,3 +96,7 @@ enum {
 #define TCG_AREG0 TCG_REG_R27
 
 #define TCG_TARGET_HAS_GUEST_BASE
+
+#define tcg_qemu_tb_exec(env, tb_ptr) \
+    ((long REGPARM __attribute__ ((longcall)) \
+      (*)(void *, void *))code_gen_prologue)(env, tb_ptr)
diff --git a/tcg/tcg.h b/tcg/tcg.h
index 015f88ae69..ca48075175 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -584,10 +584,9 @@ TCGv_i32 tcg_const_local_i32(int32_t val);
 TCGv_i64 tcg_const_local_i64(int64_t val);
 
 extern uint8_t code_gen_prologue[];
-#if defined(_ARCH_PPC) && !defined(_ARCH_PPC64)
-#define tcg_qemu_tb_exec(env, tb_ptr)                                    \
-    ((long REGPARM __attribute__ ((longcall)) (*)(void *, void *))code_gen_prologue)(env, tb_ptr)
-#else
-#define tcg_qemu_tb_exec(env, tb_ptr)                                    \
+
+/* TCG targets may use a different definition of tcg_qemu_tb_exec. */
+#if !defined(tcg_qemu_tb_exec)
+# define tcg_qemu_tb_exec(env, tb_ptr) \
     ((long REGPARM (*)(void *, void *))code_gen_prologue)(env, tb_ptr)
 #endif