diff --git a/src/input_cp2k_dft.F b/src/input_cp2k_dft.F
index 57dadfc186..2f2049d607 100644
--- a/src/input_cp2k_dft.F
+++ b/src/input_cp2k_dft.F
@@ -1841,7 +1841,8 @@ CONTAINS
                           description="Print only the upper triangular part of the matrix. ", &
                           usage="UPPER_TRIANGULAR {logical}", &
                           repeats=.FALSE., &
-                          default_l_val=.FALSE.)
+                          default_l_val=.FALSE., &
+                          lone_keyword_l_val=.TRUE.)
       CALL section_add_keyword(print_key, keyword)
       CALL keyword_release(keyword)
       CALL section_add_subsection(section, print_key)
@@ -1864,7 +1865,8 @@ CONTAINS
                           description="Print only the upper triangular part of the matrix. ", &
                           usage="UPPER_TRIANGULAR {logical}", &
                           repeats=.FALSE., &
-                          default_l_val=.FALSE.)
+                          default_l_val=.FALSE., &
+                          lone_keyword_l_val=.TRUE.)
       CALL section_add_keyword(print_key, keyword)
       CALL keyword_release(keyword)
       CALL section_add_subsection(section, print_key)