diff --git a/Tools/GNUMake/Make.machines b/Tools/GNUMake/Make.machines
index 39eb3547b13..a79856c4e9c 100644
--- a/Tools/GNUMake/Make.machines
+++ b/Tools/GNUMake/Make.machines
@@ -76,9 +76,11 @@ endif
 
 ifeq ($(findstring alcf.anl.gov, $(host_name)),alcf.anl.gov)
   ifeq ($(findstring theta, $(host_name)), theta)
+  ifneq ($(findstring thetagpu, $(host_name)), thetagpu)
     which_site := alcf
     which_computer := theta
   endif
+  endif
   ifeq ($(findstring polaris, $(host_name)), polaris)
     which_site := alcf
     which_computer := polaris