diff --git a/include/jemalloc/internal/jemalloc_internal.h.in b/include/jemalloc/internal/jemalloc_internal.h.in
index 8ba4a19a..c35280fa 100644
--- a/include/jemalloc/internal/jemalloc_internal.h.in
+++ b/include/jemalloc/internal/jemalloc_internal.h.in
@@ -155,7 +155,9 @@ static const bool config_cache_oblivious =
 #endif
 
 #include "jemalloc/internal/ph.h"
+#ifndef __PGI
 #define	RB_COMPACT
+#endif
 #include "jemalloc/internal/rb.h"
 #include "jemalloc/internal/qr.h"
 #include "jemalloc/internal/ql.h"