diff --git a/rtengine/gauss.h b/rtengine/gauss.h
index bf9cc271d..b2610af0f 100644
--- a/rtengine/gauss.h
+++ b/rtengine/gauss.h
@@ -227,6 +227,8 @@ template<class T> void gaussVertical (T** src, T** dst, AlignedBufferMP<double>
         
         for (int j=0; j<H; j++)
             dst[j][i] = (T)temp2[j];
+
+        buffer.release(pBuf);
     }
 }