diff --git a/src/muscle-tab.c b/src/muscle-tab.c
index bd1fd174..d187f828 100644
--- a/src/muscle-tab.c
+++ b/src/muscle-tab.c
@@ -426,6 +426,7 @@ muscle_percent_define_insert (char const *variable, location variable_loc,
   if (how == MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE
       && muscle_find_const (name))
     {
+      unsigned i = 0;
       muscle_percent_define_how how_old =
         atoi (muscle_find_const (how_name));
       if (how_old == MUSCLE_PERCENT_DEFINE_F)
@@ -433,10 +434,11 @@ muscle_percent_define_insert (char const *variable, location variable_loc,
           free (variable_tr);
           return;
         }
-      complain_at (variable_loc, _("%%define variable %s redefined"),
-                   quote (variable));
-      complain_at (muscle_percent_define_get_loc (variable),
-                   _("previous definition"));
+      complain_at_indent (variable_loc, &i,
+                          _("%%define variable %s redefined"), quote (variable));
+      i += SUB_INDENT;
+      complain_at_indent (muscle_percent_define_get_loc (variable), &i,
+                          _("previous definition"));
     }
 
   MUSCLE_INSERT_STRING (name, value);
diff --git a/tests/input.at b/tests/input.at
index fc92abe0..2facf9ee 100644
--- a/tests/input.at
+++ b/tests/input.at
@@ -928,9 +928,9 @@ start: ;
 
 AT_BISON_CHECK([[input-redefined.y]], [[1]], [],
 [[input-redefined.y:2.9-11: %define variable 'var' redefined
-input-redefined.y:1.9-11: previous definition
+input-redefined.y:1.9-11:     previous definition
 input-redefined.y:3.10-12: %define variable 'var' redefined
-input-redefined.y:2.9-11: previous definition
+input-redefined.y:2.9-11:      previous definition
 ]])
 
 AT_DATA([input-unused.y],
@@ -985,7 +985,7 @@ start: ;
 ]])
 AT_BISON_CHECK([[-Dvar=cmd-d input-dg.y]], [[1]], [],
 [[input-dg.y:1.9-11: %define variable 'var' redefined
-<command line>:2: previous definition
+<command line>:2:      previous definition
 ]])
 
 AT_DATA([[input-unused.y]],