diff --git a/NEWS b/NEWS
index c427a89b3..007586a24 100644
--- a/NEWS
+++ b/NEWS
@@ -40,9 +40,10 @@ New in spot 2.0.2a (not yet released)
     appearing in these three papers: Dwyer et al (FMSP'98), Etessami &
     Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
 
-  * Arguments passed to -x that are not used are now reported as they
-    might be typos.  (This ocurred a couple of times in our
-    test-suite.)
+  * Arguments passed to -x (in ltl2tgba, ltl2tgta, autfilt, dstar2tgba)
+    that are not used are now reported as they might be typos.
+    This ocurred a couple of times in our test-suite.  A similar
+    check is done the the arguments of autfilt --sat-minimize=...
 
   Library:
 
diff --git a/spot/twaalgos/dtwasat.cc b/spot/twaalgos/dtwasat.cc
index 82cd20e86..7c495f97a 100644
--- a/spot/twaalgos/dtwasat.cc
+++ b/spot/twaalgos/dtwasat.cc
@@ -1296,6 +1296,10 @@ namespace spot
     int max_states = om.get("max-states", -1);
     auto accstr = om.get_str("acc");
     bool colored = om.get("colored", 0);
+    int preproc = om.get("preproc", 3);
+
+    // No more om.get() below this.
+    om.report_unused_options();
 
     // Assume we are going to use the input automaton acceptance...
     bool user_supplied_acc = false;
@@ -1327,7 +1331,7 @@ namespace spot
       target_is_buchi = acccond.is_buchi();
     }
 
-    if (int preproc = om.get("preproc", 3))
+    if (preproc)
       {
         postprocessor post;
         auto sba = (state_based && a->prop_state_acc()) ?
diff --git a/tests/core/minusx.test b/tests/core/minusx.test
index 8d16036bd..41829a2be 100755
--- a/tests/core/minusx.test
+++ b/tests/core/minusx.test
@@ -28,3 +28,9 @@ ltl2tgba -F- -x ba-simul,foo,bar </dev/null 2>error && exit 1
 grep -v 'ba-simul' error
 grep -- "- 'foo'" error
 grep -- "- 'bar'" error
+
+# Likewise for --sat-minimise
+
+ltl2tgba -f FGa | autfilt -D |
+autfilt --sat-minimize='acc="co-Buchi",other' 2>error && exit 1
+grep "autfilt: option 'other' was not used" error