diff --git a/sdk/include/opentelemetry/sdk/resource/semantic_conventions.h b/sdk/include/opentelemetry/sdk/resource/semantic_conventions.h
index fd67abc560..9ff985be4d 100644
--- a/sdk/include/opentelemetry/sdk/resource/semantic_conventions.h
+++ b/sdk/include/opentelemetry/sdk/resource/semantic_conventions.h
@@ -13,19 +13,6 @@
 #include "opentelemetry/common/macros.h"
 #include "opentelemetry/version.h"
 
-/*
- * Special considerations for HostArchValues
- *
- * The sys/systemcfg.h header on AIX is known to define an IA64 macro,
- * which collides with HostArchValues::IA64.
- */
-#ifdef _AIX
-#  ifdef IA64
-#    pragma message "Removing define on IA64"
-#    undef IA64
-#  endif
-#endif
-
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace sdk
 {