diff --git a/libavfilter/vsrc_testsrc.c b/libavfilter/vsrc_testsrc.c
index 3d2f93683f..fc8eb727b8 100644
--- a/libavfilter/vsrc_testsrc.c
+++ b/libavfilter/vsrc_testsrc.c
@@ -30,7 +30,7 @@
  * rgbtestsrc is ported from MPlayer libmpcodecs/vf_rgbtest.c by
  * Michael Niedermayer.
  *
- * smptebars and smptehdbars is by Paul B Mahol.
+ * smptebars and smptehdbars are by Paul B Mahol.
  */
 
 #include <float.h>