diff --git a/test/ref/img_formats.txt b/test/ref/img_formats.txt
index c0c4d8bb4d..0abbbe94ee 100644
--- a/test/ref/img_formats.txt
+++ b/test/ref/img_formats.txt
@@ -716,8 +716,8 @@ monob: [GENERIC] fcsp=rgb ctype=uint
     {0/1/[0:0] 0/0/[0:0] 0/0/[0:0] 0/0/[0:0] }
   AVD: name=monob chroma=0:0 flags=0x4 [bs]
     0: p=0  st=1  o=0  sh=7  d=1
-monow: [GENERIC] ctype=uint
-  Legacy desc: [yuv][le][be]
+monow: [GENERIC] fcsp=rgb ctype=uint
+  Legacy desc: [rgb][le][be]
     planes=1, chroma=0:0 align=8:1 bits=1 cbits=1
     {0/1/[0:0] 0/0/[0:0] 0/0/[0:0] 0/0/[0:0] }
   AVD: name=monow chroma=0:0 flags=0x4 [bs]
diff --git a/video/img_format.c b/video/img_format.c
index b1247747ea..30f84222c7 100644
--- a/video/img_format.c
+++ b/video/img_format.c
@@ -416,7 +416,9 @@ enum mp_csp mp_imgfmt_get_forced_csp(int imgfmt)
     if (pixdesc && (pixdesc->flags & AV_PIX_FMT_FLAG_RGB))
         return MP_CSP_RGB;
 
-    if (pixfmt == AV_PIX_FMT_PAL8 || pixfmt == AV_PIX_FMT_MONOBLACK)
+    if (pixfmt == AV_PIX_FMT_PAL8 ||
+        pixfmt == AV_PIX_FMT_MONOBLACK ||
+        pixfmt == AV_PIX_FMT_MONOWHITE)
         return MP_CSP_RGB;
 
     return MP_CSP_AUTO;