diff --git a/src/endf.F90 b/src/endf.F90
index 0d458a0ab6..58b5549972 100644
--- a/src/endf.F90
+++ b/src/endf.F90
@@ -257,7 +257,7 @@ contains
       else
         retval  = (MT >= MISC .and. MT /= 27)
       end if
-    elseif (MT < 200) then
+    elseif (MT <= 200) then
       retval = (.not. is_disappearance(MT))
     else
       retval = .false.