diff --git a/source/blender/render/intern/source/render_result.c b/source/blender/render/intern/source/render_result.c
index 35b06385ae6..c779b01afaa 100644
--- a/source/blender/render/intern/source/render_result.c
+++ b/source/blender/render/intern/source/render_result.c
@@ -1094,6 +1094,10 @@ ImBuf *render_result_rect_to_ibuf(RenderResult *rr, RenderData *rd)
 		if (BKE_imtype_valid_depths(rd->im_format.imtype) & (R_IMF_CHAN_DEPTH_12 | R_IMF_CHAN_DEPTH_16 | R_IMF_CHAN_DEPTH_24 | R_IMF_CHAN_DEPTH_32)) {
 			IMB_float_from_rect(ibuf);
 		}
+		else  {
+			/* ensure no float buffer remained from previous frame */
+			ibuf->rect_float = NULL;
+		}
 	}
 
 	/* color -> grayscale */