diff --git a/Makefile.system b/Makefile.system
index fe6be79db..2cf1322a9 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -699,7 +699,7 @@ endif
 
 ifeq ($(C_COMPILER), PGI)
 ifdef BINARY64
-CCOMMON_OPT += -tp p7-64
+CCOMMON_OPT += -tp p7-64 -D__MMX__ -Mnollvm
 else
 CCOMMON_OPT += -tp p7
 endif