diff --git a/plugins/ladspa_effect/calf/calf/osc.h b/plugins/ladspa_effect/calf/calf/osc.h
index 36c19fe3c..0d75c575a 100644
--- a/plugins/ladspa_effect/calf/calf/osc.h
+++ b/plugins/ladspa_effect/calf/calf/osc.h
@@ -111,9 +111,7 @@ struct bandlimiter
     void make_waveform(float output[SIZE], int cutoff, bool foldover = false)
     {
         dsp::fft<float, SIZE_BITS> &fft = get_fft();
-        std::vector<std::complex<float> > new_spec, iffted;
-        new_spec.resize(SIZE);
-        iffted.resize(SIZE);
+        std::complex<float> new_spec[SIZE], iffted[SIZE];
         // Copy original harmonics up to cutoff point
         new_spec[0] = spectrum[0];
         for (int i = 1; i < cutoff; i++)
@@ -146,7 +144,7 @@ struct bandlimiter
                 new_spec[SIZE - i] = 0.f;
         }
         // convert back to time domain (IFFT) and extract only real part
-        fft.calculate(new_spec.data(), iffted.data(), true);
+        fft.calculate(new_spec, iffted, true);
         for (int i = 0; i < SIZE; i++)
             output[i] = iffted[i].real();
     }
diff --git a/plugins/ladspa_effect/calf/src/organ.cpp b/plugins/ladspa_effect/calf/src/organ.cpp
index 661b73b15..18373c89d 100644
--- a/plugins/ladspa_effect/calf/src/organ.cpp
+++ b/plugins/ladspa_effect/calf/src/organ.cpp
@@ -171,11 +171,10 @@ static void padsynth(bandlimiter<ORGAN_WAVE_BITS> blSrc, bandlimiter<ORGAN_BIG_W
         blDest.spectrum[ORGAN_BIG_WAVE_SIZE - i] = conj(blDest.spectrum[i]);
     }
     // same as above - put large array on heap to avoid stack overflow in ingen
-    vector<float> tmp;
-    tmp.resize(ORGAN_BIG_WAVE_SIZE);
-    blDest.compute_waveform(tmp.data());
-    normalize_waveform(tmp.data(), ORGAN_BIG_WAVE_SIZE);
-    blDest.compute_spectrum(tmp.data());
+    float tmp[ORGAN_BIG_WAVE_SIZE];
+    blDest.compute_waveform(tmp);
+    normalize_waveform(tmp, ORGAN_BIG_WAVE_SIZE);
+    blDest.compute_spectrum(tmp);
     
     // limit is 1/2 of the number of harmonics of the original wave
     result.make_from_spectrum(blDest, foldover, ORGAN_WAVE_SIZE >> (1 + ORGAN_BIG_WAVE_SHIFT));