diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 49f95aa57..dacf64d45 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -215,6 +215,7 @@ jobs:
         run: |
             curl -L https://install.perlbrew.pl | bash
             source ~/perl5/perlbrew/etc/bashrc
+            yes|sudo perl -MCPAN -e 'CPAN::Shell->notest("install","Devel::PatchPerl")'
             perlbrew install --notest -D ${{ matrix.weirdness }} perl-5.40.0 --as perl-5.40.0-${{ matrix.weirdness }} || (cat ~/perl5/perlbrew/build.perl-5.40.0.log; false)
       - name: run tests
         env:
@@ -223,7 +224,7 @@ jobs:
           MAKEFLAGS: --jobs=4
         run: |
             source ~/perl5/perlbrew/etc/bashrc
-            perlbrew switch perl-5.32.0-${{ matrix.weirdness }}
+            perlbrew switch perl-5.40.0-${{ matrix.weirdness }}
             perlbrew install-cpanm
             perl -V|grep archname
             (cpanm -n ExtUtils::MakeMaker Devel::CheckLib File::Which && cpanm -n --installdeps .) || ( cat ~/.cpanm/build.log && false )
diff --git a/lib/PDL/IO/Misc.pd b/lib/PDL/IO/Misc.pd
index 61beae1af..d23f823a1 100644
--- a/lib/PDL/IO/Misc.pd
+++ b/lib/PDL/IO/Misc.pd
@@ -132,7 +132,7 @@ sub _burp_1D {
    } else {
       # could add POSIX::strtol for hex and octal support but
       # can't break float conversions (how?)
-      $data->slice("$start:$index") .= pdl($data->type, $databox);
+      $data->slice("$start:$index") .= pdl($databox);
    }
    $_[0] = [ $data, [] ];
 }
diff --git a/lib/PDL/Primitive.pd b/lib/PDL/Primitive.pd
index fef6e2ae5..cdfb82127 100644
--- a/lib/PDL/Primitive.pd
+++ b/lib/PDL/Primitive.pd
@@ -3304,14 +3304,13 @@ sub PDL::interpND {
 
   } elsif($method =~ m/^f(ft|ourier)?/i) {
 
-     local $@;
-     eval "use PDL::FFT;";
+     require PDL::FFT;
      my $fftref = $opt->{fft};
      $fftref = [] unless(ref $fftref eq 'ARRAY');
      if(@$fftref != 2) {
 	 my $x = $source->copy;
 	 my $y = zeroes($source);
-	 fftnd($x,$y);
+	 PDL::FFT::fftnd($x,$y);
 	 $fftref->[0] = sqrt($x*$x+$y*$y) / $x->nelem;
 	 $fftref->[1] = - atan2($y,$x);
      }
diff --git a/t/fft.t b/t/fft.t
index 964f1b3e6..b797d85a0 100644
--- a/t/fft.t
+++ b/t/fft.t
@@ -30,6 +30,13 @@ is_pdl $pd->im, $pb->zeroes, "fft zeroes using complex ndarrays";
 is_pdl $pa, $pb, "original image recovered";
 }
 
+{
+    my $x     = xvals( 10, 10 ) + yvals( 10, 10 ) * 10;
+    my $index = cat( 3 + xvals( 5, 5 ) * 0.25, 7 + yvals( 5, 5 ) * 0.25 )
+      ->reorder( 2, 0, 1 );
+    is_pdl $x->long->interpND($index, {method=>'f'}), long('36 36 34 34 35; 51 51 49 49 50; 52 51 49 49 51; 33 33 31 31 32; 26 26 24 24 25');
+}
+
 {
 my $pb = $pa->copy;
 my $pc = $pb->zeroes;
diff --git a/t/primitive-interpolate.t b/t/primitive-interpolate.t
index 2acaa1d06..a29ef9ee4 100644
--- a/t/primitive-interpolate.t
+++ b/t/primitive-interpolate.t
@@ -37,7 +37,6 @@ subtest interpND => sub {
     is_pdl $x->long->interpND($index), $z->long, {atol=>6};
     is_pdl $x->long->interpND($index, {method=>'l'}), $z->long;
     is_pdl $x->long->interpND($index, {method=>'c'}), $z->long;
-    is_pdl $x->long->interpND($index, {method=>'f'}), long('36 36 34 34 35; 51 51 49 49 50; 52 51 49 49 51; 33 33 31 31 32; 26 26 24 24 25');
 };
 
 subtest PCHIP => sub {