diff --git a/stdcpp.h b/stdcpp.h
index 838d1766..a13fd25b 100644
--- a/stdcpp.h
+++ b/stdcpp.h
@@ -34,10 +34,12 @@ namespace std {
 
 // workaround needed for IBM XLC and debug heaps on AIX
 #if defined(_AIX) && (defined(__xlc__) || defined(__xlC__) || defined(__ibmxl__))
+# if defined(__DEBUG_ALLOC__)
 namespace std {
-	using ::_debug_memset;
-	using ::_debug_memcpy;
+  using ::_debug_memset;
+  using ::_debug_memcpy;
 }
+# endif
 #endif
 
 // make_unchecked_array_iterator