diff --git a/src/Rules.LXifort.mk b/src/Rules.LXifort.mk
index 92c9a496070fd5998c0e357b4599f7f09634e226..d39475068dc0a1f87d7c0d13c8ffa0fbf8963928 100644
--- a/src/Rules.LXifort.mk
+++ b/src/Rules.LXifort.mk
@@ -84,7 +84,7 @@ LIBS += -lz
 else
 F90 = mpiifort
 endif
-ifeq "$(MNH_INT)" "I8"
+ifeq "$(MNH_INT)" "8"
 OPT_BASE         += -ilp64
 endif
 else