diff --git a/libavfilter/vf_colormatrix.c b/libavfilter/vf_colormatrix.c
index 5ab175b65d..91ca057fd0 100644
--- a/libavfilter/vf_colormatrix.c
+++ b/libavfilter/vf_colormatrix.c
@@ -37,7 +37,7 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/avstring.h"
 
-#define NS(n) n < 0 ? (int)(n*65536.0-0.5+DBL_EPSILON) : (int)(n*65536.0+0.5)
+#define NS(n) ((n) < 0 ? (int)((n)*65536.0-0.5+DBL_EPSILON) : (int)((n)*65536.0+0.5))
 #define CB(n) av_clip_uint8(n)
 
 static const double yuv_coeff[4][3][3] = {