diff --git a/tcg/ppc/tcg-target.h b/tcg/ppc/tcg-target.h
index 0197e79930..f2ed4d74aa 100644
--- a/tcg/ppc/tcg-target.h
+++ b/tcg/ppc/tcg-target.h
@@ -65,11 +65,11 @@ enum {
 /* used for function call generation */
 #define TCG_REG_CALL_STACK TCG_REG_R1
 #define TCG_TARGET_STACK_ALIGN 16
-#if defined __APPLE__
+#if defined _CALL_DARWIN
 #define TCG_TARGET_CALL_STACK_OFFSET 24
-#elif defined _AIX
+#elif defined _CALL_AIX
 #define TCG_TARGET_CALL_STACK_OFFSET 52
-#elif defined __linux__
+#elif defined _CALL_SYSV
 #define TCG_TARGET_CALL_ALIGN_ARGS 1
 #define TCG_TARGET_CALL_STACK_OFFSET 8
 #else