diff --git a/build/jam/BuildSetup b/build/jam/BuildSetup
index 02d0d2f5e4..cbacb00253 100644
--- a/build/jam/BuildSetup
+++ b/build/jam/BuildSetup
@@ -85,7 +85,6 @@ switch $(HAIKU_CPU) {
 }
 HAIKU_ARCH ?= $(HAIKU_CPU) ;
 HAIKU_ARCH_MACRO_DEFINE = ARCH_$(HAIKU_ARCH) ;
-HAIKU_DEFINES += HAIKU_TARGET_PLATFORM_HAIKU ;
 HAIKU_DEFINES += $(HAIKU_ARCH_MACRO_DEFINE) ;
 
 # directories
@@ -346,15 +345,6 @@ if $(HOST_PLATFORM_BEOS_COMPATIBLE)
 	CP = copyattr --data ;
 }
 
-# define macro, for identifying the platform
-switch $(HOST_PLATFORM) {
-	case r5		: HOST_DEFINES	+= HAIKU_TARGET_PLATFORM_BEOS ;
-	case bone	: HOST_DEFINES	+= HAIKU_TARGET_PLATFORM_BONE ;
-	case dano	: HOST_DEFINES	+= HAIKU_TARGET_PLATFORM_DANO ;
-	case haiku	: HOST_DEFINES	+= HAIKU_TARGET_PLATFORM_HAIKU ;
-	case linux	: HOST_DEFINES	+= HAIKU_TARGET_PLATFORM_LINUX ;
-}
-
 HOST_DEFINES += $(HOST_ARCH_MACRO_DEFINE) ;
 HOST_DEFINES += _NO_INLINE_ASM ;
 
@@ -516,6 +506,15 @@ if $(TARGET_PLATFORM) = haiku {
 	TARGET_BOOT_PLATFORM		= ;
 }
 
+# define macro, for identifying the platform
+switch $(TARGET_PLATFORM) {
+	case r5		: TARGET_DEFINES	+= HAIKU_TARGET_PLATFORM_BEOS ;
+	case bone	: TARGET_DEFINES	+= HAIKU_TARGET_PLATFORM_BONE ;
+	case dano	: TARGET_DEFINES	+= HAIKU_TARGET_PLATFORM_DANO ;
+	case haiku	: TARGET_DEFINES	+= HAIKU_TARGET_PLATFORM_HAIKU ;
+	case linux	: TARGET_DEFINES	+= HAIKU_TARGET_PLATFORM_LINUX ;
+}
+
 
 #pragma mark -