diff --git a/vp8/encoder/onyx_if.c b/vp8/encoder/onyx_if.c
index e95e44fd5..762b7e345 100644
--- a/vp8/encoder/onyx_if.c
+++ b/vp8/encoder/onyx_if.c
@@ -2611,9 +2611,8 @@ int vp8_update_entropy(VP8_COMP *cpi, int update)
 
 
 #if OUTPUT_YUV_SRC
-void vp8_write_yuv_frame(const char *name, YV12_BUFFER_CONFIG *s)
+void vp8_write_yuv_frame(FILE *yuv_file, YV12_BUFFER_CONFIG *s)
 {
-    FILE *yuv_file = fopen(name, "ab");
     unsigned char *src = s->y_buffer;
     int h = s->y_height;
 
@@ -2643,12 +2642,9 @@ void vp8_write_yuv_frame(const char *name, YV12_BUFFER_CONFIG *s)
         src += s->uv_stride;
     }
     while (--h);
-
-    fclose(yuv_file);
 }
 #endif
 
-
 static void scale_and_extend_source(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
 {
     VP8_COMMON *cm = &cpi->common;
@@ -3895,7 +3891,7 @@ static void encode_frame_to_data_rate
 #endif
 
 #ifdef OUTPUT_YUV_SRC
-    vp8_write_yuv_frame(cpi->Source);
+    vp8_write_yuv_frame(yuv_file, cpi->Source);
 #endif
 
     do