diff --git a/plugins/ladspa_effect/calf/calf/osc.h b/plugins/ladspa_effect/calf/calf/osc.h
index 36c19fe3c..ba01a2f38 100644
--- a/plugins/ladspa_effect/calf/calf/osc.h
+++ b/plugins/ladspa_effect/calf/calf/osc.h
@@ -146,7 +146,7 @@ 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.front(), &iffted.front(), 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..3d1b7eed1 100644
--- a/plugins/ladspa_effect/calf/src/organ.cpp
+++ b/plugins/ladspa_effect/calf/src/organ.cpp
@@ -173,9 +173,10 @@ static void padsynth(bandlimiter<ORGAN_WAVE_BITS> blSrc, bandlimiter<ORGAN_BIG_W
     // 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 *ptmp = &tmp.front();
+    blDest.compute_waveform(ptmp);
+    normalize_waveform(ptmp, ORGAN_BIG_WAVE_SIZE);
+    blDest.compute_spectrum(ptmp);
     
     // 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));