diff --git a/src/exprs.c b/src/exprs.c
index 265568e8149..e7947f7e4b9 100644
--- a/src/exprs.c
+++ b/src/exprs.c
@@ -183,22 +183,10 @@ Obj             EvalAnd (
     }
 
     /* handle the 'and' of two filters                                    */
-    else if (IS_PSEUDO_FILTER(opL)) {
-        if (!IS_FILTER(opL)) {
-            // support this for backwards compatibility; see discussion on
-            // https://github.com/gap-system/gap/pull/2732
-            Warning("operation '%g' used in AND-filter is not a filter",
-                    (Int)NAME_FUNC(opL), 0);
-        }
+    else if (IS_FILTER(opL)) {
         tmp = READ_EXPR(expr, 1);
         opR = EVAL_EXPR( tmp );
-        if (IS_PSEUDO_FILTER(opR)) {
-            if (!IS_FILTER(opR)) {
-                // support this for backwards compatibility; see discussion on
-                // https://github.com/gap-system/gap/pull/2732
-                Warning("operation '%g' used in AND-filter is not a filter",
-                        (Int)NAME_FUNC(opR), 0);
-            }
+        if (IS_FILTER(opR)) {
             return NewAndFilter( opL, opR );
         }
         else {
diff --git a/src/intrprtr.c b/src/intrprtr.c
index 882a6ff8e3e..4b452af69c6 100644
--- a/src/intrprtr.c
+++ b/src/intrprtr.c
@@ -1341,20 +1341,8 @@ void            IntrAnd ( void )
     }
 
     /* handle the 'and' of two filters                                    */
-    else if (IS_PSEUDO_FILTER(opL)) {
-        if (!IS_FILTER(opL)) {
-            // support this for backwards compatibility; see discussion on
-            // https://github.com/gap-system/gap/pull/2732
-            Warning("operation '%g' used in AND-filter is not a filter\n",
-                    (Int)NAME_FUNC(opL), 0);
-        }
-        if (IS_PSEUDO_FILTER(opR)) {
-            if (!IS_FILTER(opR)) {
-                // support this for backwards compatibility; see discussion on
-                // https://github.com/gap-system/gap/pull/2732
-                Warning("operation '%g' used in AND-filter is not a filter",
-                        (Int)NAME_FUNC(opR), 0);
-            }
+    else if (IS_FILTER(opL)) {
+        if (IS_FILTER(opR)) {
             PushObj( NewAndFilter( opL, opR ) );
         }
         else {
diff --git a/src/opers.h b/src/opers.h
index 7b67334b6b9..3f87360a795 100644
--- a/src/opers.h
+++ b/src/opers.h
@@ -247,15 +247,6 @@ static inline Int IS_FILTER(Obj oper)
     return v & OPER_IS_FILTER;
 }
 
-// temporary HACK, until all affected packages are fixed
-static inline Int IS_PSEUDO_FILTER(Obj oper)
-{
-    if (!IS_OPERATION(oper))
-        return 0;
-    Obj flags = FLAGS_FILT(oper);
-    return flags && TNUM_OBJ(flags) == T_FLAGS;
-}
-
 
 /****************************************************************************
 **
diff --git a/tst/testinstall/boolean.tst b/tst/testinstall/boolean.tst
index caf921c037a..7744cd4404c 100644
--- a/tst/testinstall/boolean.tst
+++ b/tst/testinstall/boolean.tst
@@ -84,16 +84,13 @@ Error, <expr> must be a filter (not a function)
 gap> IsAssociative and true;
 Error, <expr> must be a filter (not a function)
 gap> IsAssociative and Center;
-Warning, operation 'Centre' used in AND-filter is not a filter in stream:1
-<Filter "(IsAssociative and Centre)">
+Error, <expr> must be a filter (not a function)
 gap> IsAssociative and FirstOp;
 Error, <expr> must be a filter (not a function)
 gap> true and IsAssociative;
 Error, <expr> must be 'true' or 'false' (not a function)
 gap> Center and IsAssociative;
-Warning, operation 'Centre' used in AND-filter is not a filter
- in stream:1
-<Filter "(Centre and IsAssociative)">
+Error, <expr> must be 'true' or 'false' or a filter (not a function)
 gap> FirstOp and IsAssociative;
 Error, <expr> must be 'true' or 'false' or a filter (not a function)
 gap> IsAssociative and IsAssociative;
@@ -119,15 +116,13 @@ Error, <expr> must be a filter (not a function)
 gap> function() return IsAssociative and true; end();
 Error, <expr> must be a filter (not a function)
 gap> function() return IsAssociative and Center; end();
-Warning, operation 'Centre' used in AND-filter is not a filter in stream:1
-<Filter "(IsAssociative and Centre)">
+Error, <expr> must be a filter (not a function)
 gap> function() return IsAssociative and FirstOp; end();
 Error, <expr> must be a filter (not a function)
 gap> function() return true and IsAssociative; end();
 Error, <expr> must be 'true' or 'false' (not a function)
 gap> function() return Center and IsAssociative; end();
-Warning, operation 'Centre' used in AND-filter is not a filter in stream:1
-<Filter "(Centre and IsAssociative)">
+Error, <expr> must be 'true' or 'false' or a filter (not a function)
 gap> function() return FirstOp and IsAssociative; end();
 Error, <expr> must be 'true' or 'false' or a filter (not a function)
 gap> function() return IsAssociative and IsAssociative; end();