diff --git a/spa/plugins/audioconvert/audioconvert.c b/spa/plugins/audioconvert/audioconvert.c
index d1b5cd683..9df4537d6 100644
--- a/spa/plugins/audioconvert/audioconvert.c
+++ b/spa/plugins/audioconvert/audioconvert.c
@@ -1325,7 +1325,7 @@ static int ensure_tmp(struct impl *this)
 				return -ENOMEM;
 			}
 			this->tmp_datas[0][i] = SPA_PTR_ALIGN(this->tmp[0][i], MAX_ALIGN, void);
-			this->tmp_datas[0][i] = SPA_PTR_ALIGN(this->tmp[0][i], MAX_ALIGN, void);
+			this->tmp_datas[1][i] = SPA_PTR_ALIGN(this->tmp[1][i], MAX_ALIGN, void);
 		}
 		this->scratch_ports = maxports;
 	}